I want to get 200 in IIT JEE mains for that which chapters I want to concentrate more, a problem is that I am a first year degree student so there should be lack of time. So l want a better answer from you to compensate all this things?
Since you are already a first year student, there is lack of time. You need to compensate that and you have to work hard in your PCM subjects. Preparing for Chemsitry will help you a lot as it is time saving and scoring. You need to manage it on your and decide what is good for you.