Class 11th pcm with physical education

Hi guys I want to take pcm this year but i think I have a little weak base for it but ok like i literally want to do pcm cuz I want to be a pilot and I have interest in chemistry and physics but the problem is that I don't study that much and like i will work on it and I'll study properly so any tips that how can I improve my base before the session starts? Or any tips regarding pcm