During high school, I used to keep a google docs or an entire physical notebook filled with neatly typed or written out questions that I've completed, my thought processes, and the explanations for review. Then, every evening or the morning thereafter, I would methodically review all of my mistakes and try to resolve the practice questions that I've completed just to make sure that I still remember how to do them. Oftentimes, I also found that reviewing old questions several months later into the school year would help me solidify my then understanding of the topic allow allow me to form new insights. Furthermore, I often found that simply sitting down and thinking for a long time how best to write out the answer explanations to certain practice questions in a way that I understood it also really helped to clarify my own understanding, and allowed me to see how my understanding evolved over time.
This method ended up working quite well for me personally, and I ended utilising a similar method when studying for similar STEM exams, the SAT, and math competitions.
However, now that I'm taking math classes in College, I've been struggling to keep up with both the reviews, and the compiling of the past questions that I've completed due to the sheer pace and amount of content that's covered. The problem now with this is that I would end up completing a practice set of questions... only to forget how to do them again a few weeks later, meaning that by the time exam rolls around at the end of the semester, I would often completely forget how to complete questions based on content from the first few weeks of the semester. As such, even though I would completed several practice exam questions, I would find myself still struggling with questions in the final exams similar to past questions that I vaguely remember completing, yet am unable to complete in time under time pressure.
How do you keep track of, or review the past practice questions that you've completed? - if at all? Furthermore, how do you study for 2-3 maths exams within a single week?!?