I have science field (PCM). I have only 3 months left for my exams. I have not even touched any lesson. How to study and get good marks?

Well you should get a move on and start studying. Some important preparation tips are as follows: 1) Plan your schedule, even though you don't have much time. 2) Note-making is an effective method. 3) Solve previous years question papers. 4) Understand the concepts while studying. 5) Group study ca