Each mistake comes back for review the next day, then after 3, 7, 14 and 30 days. Redo the question, mark whether you got it right, and the Patterns tab shows whether your problem is concepts, careless slips, misreading or timing.
How to keep a mistake journal
Whenever you get a question wrong, in homework, a quiz or a practice test, log it straight away while you still remember what happened. Enter the subject and topic, where the question came from, and choose the type of mistake: you did not know the concept, used the wrong method, made a careless slip, misread the question, forgot a fact or formula, or ran out of time. Write one line on what went wrong and one on how you will avoid it. MistakeLog suggests a fix for each type if you are stuck.
Open the Review tab every day. Redo each due question without looking at the answer, then mark Got it right to push it further out, or Missed it again to bring it back tomorrow. After five successful reviews a mistake is mastered.
Reading your patterns
The Patterns tab counts your mistakes by type, subject and topic. Concept and method mistakes mean you need to study the material again. Careless and misread mistakes mean you need a checking routine, not more content. Memory mistakes call for flashcards, and time mistakes call for timed practice. Knowing which kind costs you the most marks tells you how to spend your revision time.
Private by design
MistakeLog has no accounts and no server-side storage. Your journal stays in this browser and is saved in local storage on this device only. Use Backup to save a file you can restore on another device.
Frequently asked questions
What is a mistake journal?
A record of the questions you got wrong, why, and what you will do differently. Reviewing it is one of the most effective ways to prepare for exams.
How does the review schedule work?
A new mistake is due tomorrow. Each time you get it right it waits longer: 3, 7, 14 and 30 days. Miss it and it comes back the next day.
Which subjects does it work for?
Any subject: math, sciences, languages, history, standardized tests and professional exams.
Is MistakeLog free?
Yes. Logging, reviewing, exporting and printing are free with no sign-up.
Is my journal stored online?
No. Your entries are saved only in this browser on this device. Use Backup to keep a copy.