10-question diagnostic
A quick check that samples the selected unit and identifies where to begin reviewing.
35-question unit review
A fuller class-test rehearsal that cycles across available CED topics and reshuffles answer choices.
Targeted mastery practice
Short sets return to weak topics, misconceptions, and material that is due for retrieval.
AP-style stimulus practice
Questions use maps, datasets, images, charts, and short sources to practice evidence-based reasoning.
Why explanations matter
A practice test is useful only if the student learns from the misses. Study Buddy states the correct answer, explains the geographic idea, records evidence by topic, and deliberately returns to recurring confusions.
Mastery is more than one good score
The mastery system looks for repeated evidence: multiple attempts, strong accuracy, a current correct streak, and successful work on more than one study day. Progress is stored locally on the device, not in a student identity profile.