Hello dear student,

As you said you are not able to do good in your class 11th physics in school so dear student try to focus on the concepts and theorems in every chapter of physics. As that will help you to gain marks. solved as many times are you can solve physics theorems of every chapter big is theorems are very important and it plays a crucial part in class 11th paper of school. I hope you understand and after understanding the concepts you can easily solve questions which are numericals that you get in paper likewise you can obtain good marks. I hope this was helpful to you.

Best wishes