This free AP Psychology study guide teaches to the redesigned College Board course — the version effective for the 2024–25 school year and beyond — and covers every one of the five units the exam tests, organized the way the course is built.[1] AP Psychology introduces the scientific study of behavior and mental processes and is one of the most popular AP courses in the country.[2]
It’s interactive, not a wall of text: every unit has a built-in checkpoint quiz, hover-able glossary terms, labeled diagrams, worked scenarios, and concept questions, so you learn by doing. Read the guide unit by unit, test yourself at each checkpoint, then round out your free prep with our practice questions and flashcards.
AP Psychology is one of the 17 AP exams — explore our AP study guides to compare and prep across the whole family.
AP Psychology Exam Snapshot
| Detail | AP Psychology |
|---|---|
| Section I | 75 multiple-choice questions · 90 minutes · 66.7% of score |
| Section II | 2 free-response questions · 70 minutes · 33.3% of score |
| FRQ types | Article Analysis Question (AAQ) + Evidence-Based Question (EBQ) |
| Units | 5 units, each ~15–25% of the multiple-choice section |
| Total time | About 2 hours |
| Scoring | 1–5 scale; a 3 or higher is generally passing and may earn college credit |
| Calculator | Not needed — no calculator-based math |
| When | Administered each May; offered on computer |
| Publisher | College Board |
The redesigned exam pairs a 75-question multiple-choice section with two scenario-driven free-response questions.
- Section I — Multiple Choice75 questions · 90 minutes · 66.7% of the score. Single-select items, some in sets tied to a scenario, table, or graph.
- 10-minute break — a short pause
- Section II — Free Response2 questions · 70 minutes · 33.3% of the score. One Article Analysis Question and one Evidence-Based Question.
Total time about 2 hours · scored 1–5. A score of 3 or higher is generally accepted for college credit.
The redesigned exam puts application over memorization: many multiple-choice items give you a scenario, table, or graph and ask which concept it illustrates, and the two free-response questions test the course’s science practices directly.[1] Spread your study across all five units — each is roughly equally weighted, so none can be skipped:
College Board reports each unit as roughly 15–25% of the multiple-choice section, so the exact mix shifts slightly each year.[1] This guide teaches all five units in order, each as a study module with its high-yield topics as checkable subsections.
Each unit contributes roughly 15–25% of the multiple-choice section, so no single unit can be skipped — spread your study across all five.
1 · Biological Bases of Behavior
About 15–25% of the exam.How biology shapes behavior: the neuron and how it fires, the chemical messengers that cross the synapse, the organization of the nervous and endocrine systems, the brain’s major structures, and states of consciousness including sleep.[1]
Neurons & Neural Firing
A neuron receives signals through its , sums them in the cell body, and — if the input crosses threshold — fires an down the axon. By the , that impulse is full strength or nothing; a stronger stimulus makes the neuron fire more often, not harder. The insulates the axon and speeds the signal.
- 1 · Dendrites — receive incoming signals.
- 2 · Cell body (soma) — sums input; fires if threshold is met.
- 3 · Axon — carries the action potential away.
- 4 · Myelin sheath — fatty insulation that speeds the impulse.
- 5 · Axon terminals — release neurotransmitters at the synapse.
By the all-or-none principle, the neuron fires a full-strength impulse once threshold is crossed — or not at all.
Neurotransmitters
carry the signal across the synapse, and each has signature roles. Leftover molecules are cleared by — the mechanism many psychoactive drugs target.
| Neurotransmitter | Main role (and what too much/little can mean) |
|---|---|
| Dopamine | Reward, pleasure, voluntary movement; linked to addiction and Parkinson's |
| Serotonin | Mood, sleep, appetite; low levels linked to depression (SSRIs raise it) |
| Acetylcholine (ACh) | Muscle movement and memory; loss linked to Alzheimer's |
| GABA | Main inhibitory messenger; calms neural activity (anxiety when low) |
| Glutamate | Main excitatory messenger; memory and learning |
| Endorphins | Natural painkillers; pleasure and pain relief |
The Nervous & Endocrine Systems
The nervous system splits into the central (brain and spinal cord) and peripheral systems; the peripheral system splits into somatic (voluntary) and autonomic (automatic) branches; and the autonomic branch splits again into the (arousing) and (calming) divisions. The is the slower hormonal communication channel.
The sympathetic and parasympathetic divisions act in opposition to keep the body in balance (homeostasis).
The Brain & Consciousness
Know the major brain structures and their jobs, plus how researchers study the brain and the basics of sleep and consciousness:
| Structure | Primary function |
|---|---|
| Amygdala | Fear, aggression, and emotional memory |
| Hippocampus | Forming new long-term (explicit) memories |
| Hypothalamus | Hunger, thirst, body temperature; the 'four F's' |
| Cerebellum | Balance, coordination, and procedural movement |
| Medulla | Automatic survival functions — heartbeat and breathing |
| Frontal lobe | Judgment, planning, and voluntary movement |
Checkpoint · Unit 1 · Biological Bases of Behavior
Question 1 of 10
A neuron will fire a complete impulse only once the incoming stimulation crosses its threshold, and the resulting impulse is the same strength regardless of how strong the triggering stimulus was. Which principle does this describe?
2 · Cognition
About 15–25% of the exam. How we sense and perceive the world, store and retrieve memories, and think — including the systematic biases that lead reasoning astray.[1]
Sensation & Perception
Sensation is detecting raw stimuli; perception is organizing and interpreting them. builds perception from sensory features upward, while uses knowledge and expectations to interpret what you sense. Gestalt principles (figure-ground, proximity, similarity, closure) describe how we group what we see.
Memory
The three-stage model moves information from to and, through , into long-term storage.
- Sensory memoryA split-second, exact copy of what you sense. Most fades instantly.
- Short-term / working memoryHeld ~15–30 seconds; ~7±2 items. Rehearsal keeps it alive; chunking expands it.
- Long-term memoryDurable, large-capacity storage. Encoding (deep, meaningful processing) moves information here.
Attention moves information from sensory to working memory; encoding moves it from working memory to long-term storage. Retrieval pulls it back out.
High-yield memory effects: the (better recall of the first and last items), chunking (grouping items to expand short-term capacity), and the interference and misinformation effects that distort recall.
Thinking, Problem-Solving & Bias
We solve problems with algorithms (slow but guaranteed) and (fast shortcuts that can mislead). Know the famous biases:
| Bias / heuristic | What it is |
|---|---|
| Availability heuristic | Judging likelihood by how easily examples come to mind |
| Representativeness heuristic | Judging by how well something fits a prototype, ignoring base rates |
| Confirmation bias | Seeking evidence that supports an existing belief |
| Framing effect | Being swayed by how a choice is worded or presented |
| Hindsight bias | The 'I knew it all along' feeling after an outcome is known |
| Functional fixedness | Seeing an object only in its usual use, blocking a solution |
Checkpoint · Unit 2 · Cognition
Question 1 of 10
A graphic designer arranges six identical icons into two tight clusters of three, separated by a wide blank space, and viewers immediately perceive two groups rather than six separate icons. This grouping based on how close the elements sit to one another reflects which Gestalt principle?
3 · Development and Learning
About 15–25% of the exam. How people grow and change across the lifespan, and the two great models of learning — classical and operant conditioning.[1]
Lifespan Development
Piaget’s four stages describe how thinking matures, anchored by two milestones: and . Growth runs on and of .
- Sensorimotor (Birth–2)Key milestone: Object permanence
- Preoperational (2–7)Key milestone: Symbolic thought; egocentrism
- Concrete operational (7–11)Key milestone: Conservation; logical concrete thought
- Formal operational (12+)Key milestone: Abstract & hypothetical reasoning
Children move through the stages in a fixed order, building knowledge through assimilation and accommodation of schemas.
Also know the major lifespan theorists: Erikson’s eight psychosocial stages (e.g., trust vs mistrust in infancy), Vygotsky’s zone of proximal development and scaffolding, Kohlberg’s stages of moral reasoning, and Ainsworth’s attachment styles (secure vs insecure), informed by Harlow’s contact-comfort monkeys.
Classical Conditioning
In (Pavlov), a neutral stimulus paired with one that triggers a reflex eventually triggers that response itself. Master the four terms: UCS, UCR, CS, CR — plus acquisition, extinction, spontaneous recovery, generalization, and discrimination.
Operant Conditioning
In (Skinner), consequences shape voluntary behavior: reinforcement strengthens it, punishment weakens it. The distinction students miss most is positive/negative (add vs remove) versus reinforcement/punishment (strengthen vs weaken):
- Learning by association between two stimuli
- Response is automatic / reflexive (salivation)
- NS + UCS → CS triggers a CR
- The learner is passive
- Learning from consequences of behavior
- Response is voluntary (pressing a lever)
- Reinforcement increases it; punishment decreases it
- The learner acts on the environment
Classical links stimuli to a reflex; operant shapes voluntary behavior through reward and punishment.
Reinforcement (green) always increases behavior; punishment (red) always decreases it. The sign is whether a stimulus is added or removed.
Checkpoint · Unit 3 · Development and Learning
Question 1 of 10
According to Piaget's theory, in which order does a child progress through the stages of cognitive development?
4 · Social Psychology & Personality
About 15–25% of the exam. How the presence of others shapes our thoughts and actions, and the major theories of what makes each person who they are — including motivation and emotion.[1]
Social Thinking & Influence
Social psychology is rich with named effects. The big ones: (over-blaming personality, under-weighting the situation), (changing attitudes to match behavior), and and obedience, demonstrated by Asch and Milgram.
| Effect | What it describes |
|---|---|
| Fundamental attribution error | Overestimating disposition, underestimating situation in others |
| Foot-in-the-door | A small request first makes a larger one more likely to be agreed to |
| Groupthink | A group's desire for harmony overrides realistic appraisal of options |
| Bystander effect | The more onlookers present, the less likely any one person helps |
| Social facilitation | Doing a well-learned task better when others are watching |
| Conformity (Asch) | Adjusting one's answer to match a group, even when it's wrong |
Theories of Personality
Compare the major frameworks: the trait-based (OCEAN), Freud’s psychodynamic model (id, ego, superego, and defense mechanisms), the humanistic view (Maslow’s hierarchy, Rogers’s unconditional positive regard), and the social-cognitive view (Bandura’s reciprocal determinism and self-efficacy).
| Approach | Core idea |
|---|---|
| Trait (Big Five) | Personality measured along five stable dimensions (OCEAN) |
| Psychodynamic (Freud) | Unconscious drives; id, ego, superego; defense mechanisms |
| Humanistic (Maslow, Rogers) | Growth toward self-actualization; positive self-concept |
| Social-cognitive (Bandura) | Behavior, thoughts, and environment interact; self-efficacy |
Motivation & Emotion
Know Maslow’s hierarchy of needs (physiological → safety → belongingness → esteem → self-actualization), drive-reduction and arousal theories, and the major theories of emotion (James-Lange, Cannon-Bard, and the Schachter-Singer two-factor theory).
Checkpoint · Unit 4 · Social Psychology & Personality
Question 1 of 10
A driver who cuts in front of others on the highway is judged by an onlooker as a rude and selfish person, even though the onlooker has no idea the driver is rushing an injured passenger to a hospital. The onlooker's quick conclusion about the driver's character best demonstrates
5 · Mental and Physical Health
About 15–25% of the exam. How psychologists define, explain, and treat psychological disorders, plus stress, coping, and well-being.[1]
Psychological Disorders
Disorders are understood through the (a predisposition triggered by stress) and the broader . Learn the defining features of the major categories:
| Disorder | Defining feature |
|---|---|
| Generalized anxiety disorder | Persistent, free-floating worry most days for months |
| Major depressive disorder | Two+ weeks of deep sadness, loss of interest, low energy |
| Bipolar disorder | Cycling between depressive lows and manic, high-energy episodes |
| OCD | Intrusive obsessions and repetitive compulsions to reduce anxiety |
| PTSD | Flashbacks, nightmares, and hypervigilance after trauma |
| Schizophrenia | Hallucinations, delusions (positive) and flat affect (negative symptoms) |
Treatment of Disorders
Match the therapy to its approach: challenges distorted thoughts and changes behavior; and token economies are behavioral techniques; psychodynamic therapy explores unconscious conflict; humanistic therapy offers unconditional positive regard; and biomedical therapy uses medication.
| Therapy | Perspective / how it works |
|---|---|
| Cognitive behavioral (CBT) | Challenge distorted thoughts + change behavior |
| Systematic desensitization | Behavioral; relaxation paired with a fear hierarchy |
| Token economy | Behavioral; reinforce target behaviors with tokens |
| Psychodynamic / psychoanalysis | Surface unconscious conflict (free association) |
| Humanistic (client-centered) | Unconditional positive regard, active listening |
| Biomedical | Medication (e.g., SSRIs, antipsychotics), ECT |
Health, Stress & Well-Being
Understand stress and coping: Selye’s general adaptation syndrome (alarm → resistance → exhaustion), the difference between problem-focused and emotion-focused coping, and the role of positive psychology in well-being. Chronic stress affects physical health through the body’s stress response.
Checkpoint · Unit 5 · Mental and Physical Health
Question 1 of 10
A man inherits a genetic predisposition toward depression, but the disorder only emerges after he endures a sudden job loss and divorce in the same year. This account, in which an underlying vulnerability surfaces only when triggered by significant life stressors, best illustrates the
Science Practices & the Free-Response Questions
The redesigned course is built on science practices — concept application, research methods and design, data interpretation, and argumentation — and the two free-response questions test them directly.[1] Knowing the content is only half the job; you must be able to apply it to a study and an argument.
| FRQ | What it asks you to do |
|---|---|
| Article Analysis Question (AAQ) | Read a short research summary; respond about its design, data, and findings |
| Evidence-Based Question (EBQ) | Use provided sources to develop and defend a psychological argument |
For both, write in clear, complete sentences, define each concept and then apply it to the prompt, and answer every part of the question. Common research-methods terms you must know: independent and dependent variables, operational definitions, random assignment vs random sampling, correlation vs causation, and confounding variables.
How to Use This Study Guide
A study guide is a map, not the whole territory — use it alongside the official College Board course materials and our free tools. Because the redesigned exam rewards application, mixed, spaced practice with scenarios and free-response writing beats one long cram of vocabulary.
- 1
Read a unit here
Work through one unit at a time, in order — biology, cognition, development & learning, social & personality, then health.
- 2
Take the checkpoint
The quick check at the end of each unit exposes what didn't stick.
- 3
Drill the gaps
Send your weak unit straight into the free practice questions and flashcards.
- 4
Practice the FRQs
Write Article Analysis and Evidence-Based responses, then review full timed practice and every miss.
AP Psychology Concept Questions
High-yield AP Psychology concepts the exam actually measures — at least one per unit. Tap any card for a short, exam-ready answer backed by an official source (College Board), then test yourself on them as flashcards.
AP Psychology Glossary
Quick definitions for the terms you’ll see most across the five AP Psychology units:
- Accommodation
- Changing an existing schema to fit new information — for example, learning to tell cats apart from dogs.
- Action potential
- The brief electrical impulse that travels down a neuron's axon when its threshold is crossed. By the all-or-none principle, it fires at full strength or not at all.
- All-or-none principle
- A neuron either fires a complete, full-strength impulse once threshold is reached, or it does not fire — a stronger stimulus changes firing frequency, not strength.
- Assimilation
- Fitting new information into an existing schema — for example, calling a cat a 'dog' because it has four legs.
- Availability heuristic
- A mental shortcut that judges likelihood by how easily examples come to mind, making vivid events seem more common than they are.
- Big Five
- The five broad trait dimensions of personality — Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism (OCEAN).
- Biopsychosocial model
- An approach that explains health and disorder through the interaction of biological, psychological, and social factors.
- Bottom-up processing
- Perception that builds from raw sensory input upward — assembling the whole from individual features.
- Classical conditioning
- Learning by association in which a neutral stimulus, paired with one that triggers a reflex, comes to trigger that response on its own (Pavlov).
- Cognitive behavioral therapy
- A widely supported therapy that challenges distorted thoughts while changing maladaptive behaviors to treat disorders like depression and anxiety.
- Cognitive dissonance
- The discomfort felt when actions clash with attitudes; people often change the attitude to match the behavior (Festinger).
- Conformity
- Adjusting one's behavior or thinking to match a group standard, demonstrated in Asch's line studies.
- Conservation
- The understanding (gained in Piaget's concrete operational stage) that quantity stays the same despite changes in shape or appearance.
- Diathesis-stress model
- The view that disorders arise when a predisposition (diathesis) interacts with environmental stress.
- Encoding
- The process of getting information into memory; deeper, more meaningful processing encodes more durably.
- Endocrine system
- The body's slower chemical communication system, which uses glands to release hormones into the bloodstream.
- Fundamental attribution error
- The tendency to overestimate personality and underestimate the situation when explaining others' behavior.
- Heuristic
- A fast mental rule of thumb that simplifies problem-solving but can produce systematic errors or bias.
- Myelin sheath
- The fatty layer wrapped around many axons that insulates them and speeds the transmission of neural impulses.
- Negative reinforcement
- Removing an unpleasant stimulus after a behavior to make the behavior more likely — not punishment.
- Negative symptoms
- In schizophrenia, the reduction or absence of normal function — flat affect, social withdrawal, and reduced speech.
- Neurotransmitter
- A chemical messenger released across the synapse to carry a signal from one neuron to the next; examples include dopamine, serotonin, and GABA.
- Object permanence
- The understanding, gained in Piaget's sensorimotor stage, that objects continue to exist even when out of sight.
- Operant conditioning
- Learning in which voluntary behavior is strengthened by reinforcement or weakened by punishment (Skinner).
- Parasympathetic nervous system
- The division of the autonomic nervous system that calms the body and conserves energy — 'rest and digest.'
- Positive reinforcement
- Adding a pleasant stimulus after a behavior to make the behavior more likely.
- Reuptake
- The reabsorption of leftover neurotransmitter molecules by the neuron that released them. Many drugs (like SSRIs) work by blocking reuptake.
- Schema
- A mental framework that organizes and interprets information, built up through experience.
- Sensory memory
- A momentary, exact record of sensory information that lasts a fraction of a second before most of it fades.
- Serial position effect
- The tendency to recall items at the beginning (primacy) and end (recency) of a list better than those in the middle.
- Sympathetic nervous system
- The division of the autonomic nervous system that arouses the body for 'fight or flight' — raising heart rate and releasing energy.
- Systematic desensitization
- A behavioral therapy that pairs relaxation with a gradual hierarchy of feared situations to reduce anxiety.
- Top-down processing
- Perception guided by prior knowledge, expectations, and context to interpret sensory information.
- Working memory
- The active short-term store that holds and manipulates about 7±2 items for roughly 15–30 seconds; rehearsal and chunking extend it.
Free AP Psychology Study Materials & Resources
Everything you need to prepare for AP Psychology is free here — no paywall, no sign-up. This guide is the foundation; pair it with the rest of our free AP Psychology study materials for active recall, timed practice, and last-minute review:
- AP Psychology Practice Test — exam-style questions across all five units, with explanations.
- AP Psychology Flashcards — active-recall decks for the high-yield theorists, terms, studies, and disorders.
AP Psychology Study Guide FAQ
The redesigned AP Psychology exam has 75 multiple-choice questions in Section I (90 minutes) and 2 free-response questions in Section II (70 minutes). The multiple-choice section is worth two-thirds of the score and the free-response section the remaining third.
The course is organized into five units: Unit 1 Biological Bases of Behavior, Unit 2 Cognition, Unit 3 Development and Learning, Unit 4 Social Psychology and Personality, and Unit 5 Mental and Physical Health. Each unit contributes roughly 15–25% of the multiple-choice section.
Section II has two question types: the Article Analysis Question (AAQ), which asks you to read a brief research summary and respond to its design and findings, and the Evidence-Based Question (EBQ), which asks you to use sources to develop and defend an argument with psychological evidence.
AP Psychology is widely considered one of the more approachable AP courses because the content is intuitive and the math is minimal, but the redesigned exam rewards applying concepts to scenarios rather than memorizing terms. Steady practice with worked examples and free-response writing is the key.
AP exams are scored 1–5. A score of 3 or higher is generally considered passing, and many colleges grant credit or placement for a 3, 4, or 5 — though each college sets its own policy. There is no fixed passing percentage; scores are scaled each year.
The redesigned course is built on science practices: concept application, research methods and design, data interpretation, and argumentation. The free-response questions test these directly, asking you to analyze a study, interpret data, and build an evidence-based argument.
Work through the five units one at a time, take the checkpoint quiz after each to find gaps, then drill that unit with our free practice questions and flashcards. Practice the Article Analysis and Evidence-Based free-response formats, and review high-yield theorists, studies, and terms before exam day.
Yes — the full guide, the checkpoints, the glossary, the practice questions, and the flashcards are 100% free, with no account required.
References
- 1.College Board. “AP Psychology Course and Exam Description.” College Board. ↑
- 2.College Board. “AP Psychology — AP Students.” College Board. ↑
- 3.College Board. “AP Psychology Exam — AP Students.” College Board. ↑
- 4.College Board. “AP Psychology — Course at a Glance.” College Board. ↑
Sources for the concept answers
Every answer in the AP Psychology concept questions above is drawn from an official primary source:
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