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.
5,504Entries
8,766Prerequisite links
12Subjects
44hRuntime
8Mapped exams
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.
BiologyCLEP
Bio 1–3891
1,133 entries 8.1h 76 over 1 min
PsychologyCLEP
Psych 1–1489
691 entries 4.9h 38 over 1 min
ChemistryCLEP
Chem 1–2561
665 entries 6.3h 142 over 1 min
Medical Terminology
MedTerm 1–1000
615 entries 4.7h 52 over 1 min
SociologyCLEP
Soc 1–1946
537 entries 3.9h 38 over 1 min
Computer ScienceDSST
CS 1–0695
326 entries 2.6h 28 over 1 min
American GovernmentCLEP
Gov 1–487
295 entries 2.5h 30 over 1 min
Artificial Intelligence
AI 1–0634
292 entries 2.5h 43 over 1 min
Logic
Logic 1–441
267 entries 2.3h 41 over 1 min
College AlgebraCLEP
Alg 1–540
263 entries 2.6h 60 over 1 min
Philosophy
Philosophy 1–0376
210 entries 1.7h 21 over 1 min
Ethics and ValuesDSST
Ethics 1–435
210 entries 1.8h 24 over 1 min