The graded tests at the bottom of your bag are the most specific study material you will ever own. Here is the twenty minutes that turns one of them into a better grade next time.
There’s a folder in your bag with three or four graded tests squashed at the bottom. You looked at the number on the front of each one. You felt whatever you felt for about ninety seconds. Then you never opened it again.
That pile is better study material than anything you can buy. A review book tells you what students in general get wrong. Those papers tell you what you got wrong, on the questions your teacher writes. Nothing else you own is aimed that well.
The content of the test doesn’t decay. Your memory of what you were thinking when you wrote the wrong answer does, and it goes fast.
A week later, all you can tell about question 11 is that you got it wrong. Two days later you still remember that you knew it was one of two things and picked the wrong one. That’s a different problem with a different fix.
You need the paper, a pen, and about twenty minutes. You’re not rewriting the test. You’re not correcting every answer. You’re sorting.
Go through every question you lost points on and put one letter beside it. There are only four letters. Every wrong answer you have ever given is one of them.
Now count the letters. This is the bit that pays. The mix is different for every person, and it decides where your next five hours go. Four Ds and one R means study more. Four Rs and one D means studying more would have changed almost nothing.
D is the easy one, and it’s flashcard territory. You didn’t have the fact. Go get the fact and put it somewhere it’ll come back round. Writing flashcards that work covers how to word it so it tests recall and not just recognition.
M doesn’t get fixed by a card on each thing. Everybody makes this mistake. If you confuse mitosis and meiosis, one card for each leaves you holding two definitions that look alike. Under pressure you grab the wrong one again.
What you need is a card about the difference. Front: “Mitosis or meiosis: which one halves the chromosome number?” Back: “Meiosis.” Then write, in one sentence, the single thing that separates them. Make sure that sentence is what your card asks about.
R isn’t a knowledge problem, so you can’t study it away. It’s a procedure problem, and the fixes are mechanical. Underline the verb in every question before you answer it. Circle not, except and least. Before you write, say what kind of answer is wanted: a number, a date, a list of two, a sentence.
Three Rs on one paper is often the biggest pile of points available to you. Picking it up takes no extra studying at all.
T is a pacing problem, until you check whether it is. Do the division. Forty questions in fifty minutes is a little over a minute each. If you spent nine minutes on question 6, you can see where the end of the paper went. Practise with a clock on, and answer everything you can do quickly before you go back for the hard ones.
Look first, though, because slow is often a costume. If you were slow on exactly the questions you were unsure about, that’s a D wearing a T. Pacing practice won’t touch it.
Most people don’t have twenty gaps. They have two or three pairs of things that live in the same drawer in their head. Those pairs cost them points on test after test.
You find them by laying two or three returned papers side by side and reading only the M answers. A pair will repeat. It’s oddly specific and a bit embarrassing when you see it, and that moment of recognition is the useful bit.
Studying each one harder on its own is what got you here, so don’t do that again. Write the two of them on one line each, one directly under the other, and put down only the thing they differ on. “Mitosis: two identical cells. Meiosis: four cells with half the chromosomes.”
Then make the card force a choice between the two. Asking for a definition won’t do it. What you want to practise is telling them apart.
This is the one place the app is worth naming. Get a question wrong on Machi.study’s practice test and the summary doesn’t just mark it wrong. It tells you which other card that answer actually belongs to. If the same two cards keep pointing at each other, you’ve found your pair without having to spot it yourself.
There are two kinds of right answer, and only one of them is really yours. On a multiple-choice paper, some of your correct answers came from cutting two options and picking between the other two. Those won’t survive a slightly harder version of the same question.
The cheap way to catch them is during the test itself. Put a small dot beside any question you weren’t sure of. It takes half a second. When you get the paper back, the dots have done the sorting for you.
If you didn’t do that, go back through the right answers, cover each one, and try to say why the other options are wrong. The ones where you can’t are the shaky ones. Being honest about this, it’s slow, and most people won’t do it for every test. Do it for the material that comes back on the final.
Ten cards. Not sixty. A returned test can easily give you sixty. A set of sixty cards built out of one bad afternoon is a set nobody opens again.
Pick them in this order. Every M pair becomes one difference card, and there are usually two or three. Every D that’s on the syllabus gets a card, and the one-off bit of trivia doesn’t. Anything you couldn’t produce cold gets one: a formula, the steps of a process, a definition you half-had. That normally comes to eight or twelve.
Put them in the set you already have for that class. Don’t start a new one. That way they come round mixed in with everything else, instead of sitting in a folder called “Unit 3 mistakes” that you won’t open.
The R and the T problems don’t become cards, because they aren’t facts. They become one line you write at the top of your next test paper before you start. For most people it’s something like “underline the question word” or “skip anything over a minute.”
Four tests in a term, ten cards each, is forty cards built entirely out of your own mistakes. Review them a little at a time and you’ll have seen each one a dozen times by the final. They’re the exact forty things you were most likely to drop points on.
Compare that with the usual approach. You open the textbook in May and study the whole unit evenly, including the eighty percent you already knew in November. The returned tests told you where to aim. All you had to do was not throw them away.
Next: how to plan the weeks before the next one, or why the night before feels like it worked.