When you finish, every wrong answer from one practice test will be a flashcard in Box 1 of a Leitner box. Each card asks for the rule you missed, and each is tagged with why you missed it. For a full-length test, plan on about two hours, which matches the review time Flint suggests for a 2 hour 14 minute SAT.

One thing to know before you start: the card should not ask for the answer to that one question. It should ask for the principle, because the next test will not reuse the question.

What you need

  • One scored practice test with answer explanations

    SAT, MCAT, LSAT or bar. Do not read the explanations yet.

  • An error log

    A spreadsheet or notebook with columns for question number, topic, error type, the rule in your own words, and a retest date.

  • Index cards and a box with dividers, or a Leitner app

    Imprimo puts the useful limit of a paper box at about 150 cards. Past that, it suggests an app.

  • Four error-type tags

    Content gap, slip, timing, misread. These are Flint's categories. Colored dots or a corner code both work.

From one wrong answer to one card

  1. Re-work the missed question cold

    Solve it again before you open the explanation, as Flint advises. When it worked: you either reach the right answer or confirm you cannot.

  2. Tag the cause in the log

    Choose one tag. Content gap means you did not know the rule. Slip means you knew it but made an execution error, such as a dropped negative sign. Timing means you rushed. Misread means you solved a different question from the one asked. When it worked: every row has exactly one tag.

  3. Write the rule in your own words

    Now read the explanation. Then write, in one sentence, the rule you will apply next time. When it worked: the sentence still makes sense without the original question beside it.

  4. Turn the rule into a question

    Put a prompt on the front of the card that makes you produce the rule, and put the rule on the back. Here is a hypothetical: you dropped a negative sign on a multistep algebra item. A weak front reads "Answer to Q14: C." A strong front reads "Before choosing an answer on a multistep algebra problem, what do you check?" When it worked: you can answer the front in under ten seconds, the limit the LEAI blog gives for a usable card.

  5. Mark the tag on the card

    Write the error type and the section in one corner. When it worked: you can sort the deck by tag without reading the cards.

  6. File the card in Box 1

    Each correct answer moves a card up one box. A wrong answer sends it straight back to Box 1, whatever box it was in. That rule appears in both Leitner's system and Enthuware's practice-question version. How often each box comes up is set out in the schedules for 3, 5 and 7 boxes. When it worked: Box 1 holds every new card and nothing else.

  7. Count the tags after each test

    Test Ninjas has a 30 Percent Rule. If one question type accounts for more than 30% of your misses, drill that type untimed before you take another full test. When it worked: you can name your most common error in one word.

Why cards at all? In Roediger and Karpicke's 2006 work, students who tested themselves remembered significantly more a week later than students who reread. That finding is about remembering. It does not show that recalling a rule lets you apply it to a problem you have never seen. Keep that limit in mind.

If it did not work

Recalling a rule is not the same as using it. Fix this by keeping a retest date in the log. Flint sets it one week out. On that date, work a new problem of the same type cold. If you miss it, the card stays in Box 1.

You added too many cards at once. Imprimo caps new cards in Box 1 at 50, and LeitnerBox.io suggests a deck of 20 to 30 to start. If your Box 1 is already swollen, the page on [clearing an overloaded Box 1](/too-many-cards-in-leitner-box-1-fix-it/) walks through the fix.

Mostly no. A card can remind you of a pacing check, but nothing here shows that flashcards fix slow work. Keep timing misses in the log, and handle them with timed sections.

No. LeitnerBox.io lists early promotion as a common mistake. Wait for the next scheduled review, and promote the card only if you recall it cold.

Once the box is filled

Every practice test now feeds one box, and every card in it tests a rule you have already gotten wrong once. Repeat steps one through seven after each test. If you have not built the box itself yet, do that first.

Need the physical box?

Build one from a shoebox, index cards and dividers.

Make a Leitner box at home