Most study guides are beautifully formatted rereading. Highlighted headings, tidy summaries, the textbook's sentences arranged like furniture — and then the exam asks you to produce knowledge the guide only ever asked you to recognize. This builder makes the other kind of study guide: one that quizzes you back.

A card is three lines

The guide holds up to eight cards, and each card asks for exactly three things:

The concept. Osmosis. The Krebs cycle. Enzyme inhibition.

The idea in your own words. As you'd explain it to a friend — water moves toward the saltier side, no energy needed. This line is where the guide earns its keep, because translation is diagnosis: when the own-words line won't come, that card has just told you precisely where tonight goes. Copying the textbook's phrasing teaches the textbook, not you.

One question a fair examiner would ask. Which way does the water go, and what does it cost the cell? Writing the question is half the studying; it forces you to see the concept from the side the exam will approach it.

Eight cards is the cap, and it's a feature: a guide that fits one page gets reread, retested, and finished. When a ninth concept insists, that's the next chapter's guide introducing itself.

Covered mode is the whole point

One tap on cover the answers and every own-words line disappears under ink, leaving your questions staring back. Answer from memory, reveal, mark your confidence — shaky, getting there, solid — and let the readout schedule you: retest the shaky ones first tomorrow.

This isn't a gimmick; it's the best-attested move in learning science operationalized. Roediger and Karpicke's testing-effect experiments showed that retrieving material from memory strengthens retention well beyond restudying it — and when Dunlosky's team graded ten study techniques across the literature, practice testing took a top utility rating while the summarizing-and-highlighting that fills most study guides landed at the bottom. The builder simply makes the high-utility loop — question, retrieve, check, mark — the guide's default posture instead of an extra effort.

The shelf this sits on

The builder covers one exam's concepts; the rest of the term has its own tools. The Study Style Quiz is the fifteen-question diagnosis of how you study across all five habit dimensions — this page is effectively its self-testing dimension turned into a working tool. The Revision Timetable decides when each guide gets its covered-mode sessions as the exam walks closer, and the Semester Goal Worksheet holds the term-level goal these sessions serve.

Eight cards. Three lines each. Cover, retrieve, mark — the guide that studies you back.