I do. I write down any practice problem (whether it be from practice tests or practice material such as EK 1001's) that I got wrong into a spiral note book with respect to the area of study. Therefore, I have a notebook for bio, organic chem, gen chem, and physics. I have found reviewing these notebooks once a week helps me learn from mistakes since I write down the question, the answer choices, my original answer, the correct answer, and the explanation. This may not work for everyone, but I figure it can't hurt to not forget why you got question xyz wrong (especially since I have done thousands of questions so far). Hope this helps 🙂 .