JLPT Error Log: How to Review Your Mistakes and Raise Your Score

A JLPT error log is a short record of every question you got wrong, why you got it wrong, and when you will test yourself on it again. It works better than rereading explanations because it shows which kind of mistake is costing you points, and that is rarely the kind you assume.

Most learners treat a wrong answer as a one-time event. They read the explanation, nod, and move on to the next practice set. Two weeks later the same grammar point or the same kanji reading catches them again. The log breaks that loop.

Why checking the answer key is not a review

When you see the correct option and think "of course, I knew that," you have only recognised the answer. On test day nobody shows you the answer, so recognition does not help. A review has to force you to produce the answer, or at least to name the reason you missed it.

There is a second problem: a score alone hides the cause. Two learners can both score 30 out of 60 on a section for completely different reasons. One does not know the vocabulary. The other knows it but runs out of time on long passages. The fix for each is different, and only a record of individual mistakes can tell them apart.

What to write down for every wrong answer

Keep each entry to one line. If it takes more than a minute to log, you will stop logging by the end of the week. Record these fields:

• Source and section: which test or workbook, and whether it was Language Knowledge (vocabulary/grammar), Reading or Listening.
• The item: the word, grammar pattern, or a short note on the question.
• What you chose and what was correct.
• Cause tag: one of the five tags below.
• Fix: one concrete action, such as "write three sentences" or "listen again with the script".

A spreadsheet is enough. Paper works too, as long as you can sort or group the entries by tag.

The five cause tags

Tagging is the part that makes the log useful. Pick the closest tag even when two seem to apply.

1. Did not know the word or kanji. The vocabulary or reading was simply new. The fix is to learn the item properly and attach it to a sentence. Kanji with several readings deserve a note on the context that triggers each one. For example, 一日 is read いちにち when it means "one day" and ついたち when it means "the first of the month". If you lost a point on this, log the pair together, not just the reading you missed.

2. Knew the word, misjudged the form. Conjugation and connection errors belong here: choosing a plain form where the pattern needs the て-form, or attaching a pattern to the wrong part of speech. The fix is to rewrite the pattern's connection rule in your own words and produce two or three of your own sentences.

3. Confused two similar grammar points. This is the classic JLPT trap, where two patterns look alike and differ in nuance. Take わけにはいかない and わけではない. The first means you cannot do something because circumstances or obligation forbid it, as in:

明日試験があるので、遊ぶわけにはいかない。

The second softens a statement into "it is not necessarily the case that", as in:

勉強していないわけではないが、成績が上がらない。

The first sentence says you cannot play because of tomorrow's exam. The second says it is not that you have not been studying, but your results are not improving. Log confusing pairs as one entry with a one-line contrast, not as two separate entries. The contrast is the thing you need to remember.

4. Misread the question or the passage. You knew every word and still chose the wrong option, often by missing a negative, a contrast marker such as しかし, or a detail the question asked about. The fix here is a habit, not more content: underline the question word first, and circle negatives and contrast words while reading.

5. Ran out of time or lost focus. In Reading, this shows up as guessing the last passages. In Listening, it shows up as losing the thread of a long conversation. The fix is a timing target per section and practice at that pace, not more vocabulary.

Keep the log small enough to survive

The most common reason error logs fail is size. If you copy out every wrong answer from a full mock test, you will have a hundred rows and no energy to review them. Two rules keep it manageable:

• Log patterns, not questions. If three wrong answers all come from the same grammar contrast, that is one row with a tally.
• Cap the active list. When a row has been answered correctly on three separate reviews, move it to an archive tab. The active list stays short, and it always shows what still hurts.

A review rhythm that fits around a job

You do not need long sessions. A simple rhythm is enough:

• Same day: log the mistakes right after the practice set, while you still remember what you were thinking.
• Next day: cover the correct answer and the fix, then try to answer from the item alone.
• One week later: retest the rows that you got wrong the first time. Anything missed again gets a new fix, not just another reading.
• One month later: a quick pass over the archive to catch anything that has decayed.

Fifteen minutes a day is more effective than a three-hour block on the weekend, because the retests are spread out in time.

Use the log to watch your weakest section

The JLPT is not passed on the total alone. A pass needs the overall pass mark and the minimum score in every section, so a strong total with one weak section is still a fail. Because your log records the section for each mistake, you can count rows per section every week. If one section holds far more active rows than the others, that is where your next study block should go, even if it is not the section you enjoy most.

Look at the cause tags the same way. A pile of tag 3 rows means you need grammar contrast drills. A pile of tag 4 rows means your accuracy problem is reading technique, and more vocabulary will not help.

The last two weeks before the exam

In the final stretch, stop adding new material and work from the log:

1. Sort the active list by how many times each item has been missed.
2. Rework the top items first, using the fix column, not the original explanation.
3. Run one timed practice set and log only the new mistakes. If the same causes appear, your log is pointing at the real gaps.
4. On the last day, read through only your contrast notes and cause-4 reminders. Do not start anything new.

A log kept this way is also a record of how you actually learn, which is useful the next time you prepare for a different level.

Where to go next

A log needs raw material: realistic questions that you can miss and learn from. If you want practice that records your answers by section and shows where points are lost, Toey's JLPT practice is built around that loop. It is a web app with no mobile app yet.

Checked on 28 October 2026.

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