College subjects, in order. Free.

Every concept on the exam blueprint gets one short spoken entry — drafted from a maintained open textbook plus an independent second source, prerequisite-linked, and machine-checked before it ships. Nothing is taught before what it depends on.

Browse 12 subjects How it is built

Entries: 5,504
Prerequisite links: 8,766
Subjects: 12
Runtime: 44h
Mapped exams: 8

The catalog

Ordered by size. Each subject is numbered end to end — start at the first entry and walk, or jump in and follow the prerequisites back.

Biology CLEP

Bio 0001–3891

1,133 entries 8.1h runtime 76 over a minute
Psychology CLEP

Psych 0001–1489

691 entries 4.9h runtime 38 over a minute
Chemistry CLEP

Chem 0001–2561

665 entries 6.3h runtime 142 over a minute
Medical Terminology

MedTerm 0001–1000

615 entries 4.7h runtime 52 over a minute
Sociology CLEP

Soc 0001–1946

537 entries 3.9h runtime 38 over a minute
Computer Science DSST

CS 0001–0695

326 entries 2.6h runtime 28 over a minute
American Government CLEP

Gov 001–487

295 entries 2.5h runtime 30 over a minute
Artificial Intelligence

AI 0001–0634

292 entries 2.5h runtime 43 over a minute
Logic

Logic 001–441

267 entries 2.3h runtime 41 over a minute
College Algebra CLEP

Alg 001–540

263 entries 2.6h runtime 60 over a minute
Philosophy

Philosophy 0001–0376

210 entries 1.7h runtime 21 over a minute
Ethics and Values DSST

Ethics 001–435

210 entries 1.8h runtime 24 over a minute

College subjects, in order. Free.

The catalog

Biology CLEP

Psychology CLEP

Chemistry CLEP

Medical Terminology

Sociology CLEP

Computer Science DSST

American Government CLEP

Artificial Intelligence

Logic

College Algebra CLEP

Philosophy

Ethics and Values DSST