I'm not good at politics either, so I'll tell you something about history. First of all, don't always think the teacher is poor. Since the school has arranged for him to teach you classes, he is competent. Secondly, you can't learn history only by teachers. Know what you want to learn before class, and listen carefully in class, even if what the teacher says has nothing to do with the exam. Then after learning a chapter, you must learn to review it systematically. It is best to take a piece of paper and write down what you have learned in this chapter when you are free, and then compare it with the book to see what is missing. Just read a book before the exam. If you are too lazy to review, you may confuse what you remember. Finally, you can go to the bookstore to buy a reference book, preferably with practice.