You're not in control of most of your decisions, but you're about to find out who—or what—is.
of students scored 4 or higher in 2025
334,038 test-takers
2,797 colleges grant credit
Behavior has structure.
AP Psychology is the discipline of identifying that structure: how the brain produces thought, how development shapes personality, and why people reliably behave in ways that seem irrational until you understand the underlying mechanism.
Every unit carries equal weight on the AP exam — but students who don't understand neural mechanisms first will struggle to explain almost everything else.
The AP exam allocates its difficulty evenly across all units, with each unit contributing significantly to the overall score. However, understanding the Biological Bases of Behavior is crucial as it underpins all subsequent topics.
How the course builds
Research Methods and Critical Thinking · Biological Bases of Behavior · Cognition · Development · Motivation, Emotion, Personality · Perception · Psychological Disorders · Treatment of Psychological Disorders · Social Psychology
Biological Bases of Behavior is where most students hit a wall.
Requires understanding complex physiological processes and their psychological implications.
Students may lack a strong foundation in biology, particularly in neural mechanisms.
What You Need