This is not difficult! First of all, you should have a general understanding of the whole volume, and do it in the order of the questions, not jump. It's very important to choose topics and fill in the blanks, but it's only 50 minutes at most! Try to do it right once, and don't think about checking it again after you finish, because there is not enough time. The first three questions in book two are basic questions, so be sure to get them all right! Try to do the big questions behind, but give up if you don't understand them at all! Many people can't solve the problem, so don't worry too much! But you can put some formulas on it. So you can basically go to 120! Don't panic when you encounter problems! Sometimes the questioner at the back puts the question in front and paralyzes you. You just have to do it at the back!