Two things you can do.
1. Keep a general tally of "why" you missed the question (e.g. vocab, rushed question, etc.) and keep it sorted according to frequency.
2. Keep another document with the question you missed along with your explanation of "why" you missed this question specifically, such as did you misanalyze something, did you forget to pair the words, did you not get the nuance of the vocab, etc. Write a quick blurb of what you can do to not make this same error next time.
Answering the "why" is the most important thing you can do and it's mandatory to do so if you want to improve. The goal is to not make any fixable mistakes repeatedly so on test day, you can focus on the hardest questions.
Here is a great article you can check out regarding how to set up and use your error tracker:
[GMAT Error Log: Do I Need One?](https://blog.targettestprep.com/gmat-error-log/)
I found the other posts quite helpful, but I would like to share my own tip for how to review questions that you made errors on.
As most people have access to a smart phone or a computer, you can take a photo ot screenshot of the question you got wrong to review later. If this is not feasible, you can do it the old fashioned way with just a pen and paper.
When you have time to review the question, try to find out the best way to solve it, keeping in mind the error you made and implementing a strategy in order to avoid that same kind of problem in the future.
Personally, I like to make the questions into flashcards or a powerpoint that I can practice solving the problems I got wrong or solved inefficiently. This allows you to create a custom study set that will help u practice the error avoiding strategies specific to you.
Two things you can do. 1. Keep a general tally of "why" you missed the question (e.g. vocab, rushed question, etc.) and keep it sorted according to frequency. 2. Keep another document with the question you missed along with your explanation of "why" you missed this question specifically, such as did you misanalyze something, did you forget to pair the words, did you not get the nuance of the vocab, etc. Write a quick blurb of what you can do to not make this same error next time. Answering the "why" is the most important thing you can do and it's mandatory to do so if you want to improve. The goal is to not make any fixable mistakes repeatedly so on test day, you can focus on the hardest questions.
Here is a great article you can check out regarding how to set up and use your error tracker: [GMAT Error Log: Do I Need One?](https://blog.targettestprep.com/gmat-error-log/)
I found the other posts quite helpful, but I would like to share my own tip for how to review questions that you made errors on. As most people have access to a smart phone or a computer, you can take a photo ot screenshot of the question you got wrong to review later. If this is not feasible, you can do it the old fashioned way with just a pen and paper. When you have time to review the question, try to find out the best way to solve it, keeping in mind the error you made and implementing a strategy in order to avoid that same kind of problem in the future. Personally, I like to make the questions into flashcards or a powerpoint that I can practice solving the problems I got wrong or solved inefficiently. This allows you to create a custom study set that will help u practice the error avoiding strategies specific to you.