It must be science. You are good at this kind of math, but you don't study hard for any reason. Maybe I didn't pay attention at the beginning of school, or I fell behind for a while, and then I felt that I couldn't catch up. The more I didn't listen, the less I achieved this result. Strong knowledge continuity and understanding of physics. One of my students is in the same situation as you, but physics can make up quickly. With your mathematical thinking ability, just find someone to go over the previous knowledge and do some exercises. One month before my student's mid-term exam, I began to make up lessons for her. It is difficult to pass the exam before the make-up exam. I made up 79 in the mid-term exam for a month, and now I'm preparing for the final exam, so I think I can get 90+ (depending on my performance, of course). Many regular phenomena in chemistry are to be memorized. There is no explanation for the poor grades in chemistry except that you didn't study hard and didn't do well in the exam.