hello dear,

well you should go through your class notes and solve question from model paper I will suggest you to solve most of the question from sample model paper to revise XI and XII or if you are going to give neet exam then it's all previous year papers now and revise from notes if you do not have not take help from others and definitely you should go through your notes if you face problem that then you can have take help from internet s YouTube, Google from anywhere it all you have to solve your queries .

that's it all the best!!