How to review the practice questions you get wrong

Most people do a practice test, look at the score, and do another one. The score is the least useful thing the test produced. The useful part is the list of questions you got wrong, and the reasons you got them wrong, and almost nobody looks at it for longer than it takes to feel bad.

Here is a review routine that takes about as long as the test did, and turns each one into a study plan for the next few days. It works for certification practice, past papers, end-of-chapter questions and quiz banks alike.

Why the review matters more than the test

A practice test does two jobs. It is retrieval practice — pulling an answer out of memory strengthens it, which is why testing yourself beats re-reading — and it is a measurement of what you do not know yet. The first job is done the moment you answer. The second is only done if you read the measurement.

There is a trap in the measurement, too. A question you got right by elimination, or by a guess between two options, is scored the same as one you knew cold. If you only review what was marked wrong, the shaky ones slip through and turn up again on the day.

Step 1 — Commit before you check

The review starts during the test. Pick an answer for every question before you look anything up, and mark how sure you were: knew it, narrowed it down, or guessed. It costs a second a question.

Checking as you go is fine on a practice test; checking before you have committed is not, because then you never find out what you would have said. The commitment is what makes a wrong answer informative.

Step 2 — Sort the misses by why, not by topic

Go through every question you got wrong, and every one you marked guessed or narrowed it down, and give each one a reason. There are only a few:

• I didn’t know it. The fact or the idea was never in your head. This is the honest gap, and the easiest to fix.
• I knew it but mixed it up with something that looks similar: two ports, two drug classes, two accounting treatments. These come back again and again until you study the pair side by side.
• I misread the question — missed a NOT, a most likely, a first. That is a reading habit, not a knowledge gap, and no amount of revising the topic fixes it.
• I ran out of time or rushed the end. A pacing problem.

A test with eight misses usually turns out to be four of one kind and a scatter of the others, and the biggest group tells you what kind of work the next week needs. Sorting by topic first hides that.

Step 3 — Write the why in one line, in your own words

For every miss, write one sentence that says why the right answer is right. Then, for multiple choice, half a sentence on why your answer was wrong — what would have to be true for it to be the right one.

An example, from a networking practice set: Which port does HTTPS use by default? 21, 80, 443 or 3389. Someone who picked 80 writes: 443 is HTTP over TLS; 80 is plain HTTP. I mixed up the secure and the plain one. That line is now a card to test yourself with, and it says which pair to study side by side.

Writing it yourself is the point. Reading an explanation feels like understanding; producing one is the test of whether you do. If you cannot write the sentence without looking, you have found the real gap.

Step 4 — Retry the misses a day later, cold

Put the missed questions aside and answer them again the next day or the day after, without your notes and without the line you wrote. Spacing the retry is what makes it stick: the small effort of recalling something half-forgotten does more than the easy recall of something you read ten minutes ago.

Anything you get wrong a second time goes back in the pile for three days later. Anything you get right twice can leave it.

Step 5 — Let the pile decide the next study session

After two or three practice tests, the one-line reasons start repeating. The same three topics, the same confusable pair, the same misread wording. That short list is your study plan, and it is worth more than working through the syllabus in order again, because it is built from what you actually get wrong.

If the biggest group is misread the question, practise reading: underline the qualifier in every question stem for a whole test. If it is ran out of time, do a timed half-test and nothing else. Neither needs new material.

When the practice questions come without explanations

The routine assumes you can find out why the right answer is right, and plenty of practice material does not say: a PDF of past questions with an answer key and nothing else, a quiz bank that marks you wrong and moves on, a worksheet from a class. You end up searching each question separately, which is slow enough that people stop reviewing.

That is the case we built OneTapAnswer for. With a practice question on screen, you press Ctrl+Enter and the answer arrives as a notification, without leaving the page; on Windows, in Detailed mode a tap opens a window that explains it and says why each of the other options is wrong — which is the sentence step 3 asks you to write, so read it after you have tried writing your own, not before. It reads whatever window the question is in, so a PDF works the same as a web page.

It is for practice, homework checks and revision. In a test that does not allow outside help, it is against the rules, and the routine above is what gets you ready for that test anyway. The practice quiz on this site has a question of every common type, if you want to try the routine on something now.

The short version

1. Commit to every answer, and mark how sure you were.
2. Give every miss and every guess a reason: didn’t know, mixed up, misread, rushed.
3. Write why the right answer is right, in one line, in your words.
4. Retry the misses a day or two later, cold.
5. Study what keeps coming back.