I answer your question as a senior three student. I also went through this process, learned some knowledge of psychology, and almost forgot everything before. Mathematics is a subject that needs a lot of practice. Now I basically set a set of comprehensive papers every two days. If I forget my previous knowledge, I will turn over my notes. I found the feeling after doing more than a dozen sets. In fact, both the college entrance examination and the middle school entrance examination have routines, and the position of the first question is basically determined. It is good to practice hard. Mathematics is a subject that exercises people's thinking ability and makes them smart. So don't worry, study math.