Be sure to listen carefully and listen to the teacher's supplement, which may not be in the book! In physical chemistry, we should remember more formulas and do more problems. Don't be afraid of difficulties and troubles. We must experiment carefully in this respect. Sometimes experiment is the most memorable method. Mathematics is a logical thing with certain thinking. It is necessary to remember the formula, but it should also be used flexibly. Do more questions, don't ask. Don't accumulate math problems. Mathematics is highly interrelated, and the missing questions must be asked. Do more questions and use them flexibly! History is simple. You usually know more about history, so you can learn it by reading and reciting more! English is a language science, don't be afraid, English is actually not difficult! Speak more, recite more, master more grammar, strengthen your vocabulary at ordinary times, read more articles, check more and speak more, and you can learn English well. English is the same as Chinese, as long as you listen more and master more vocabulary, there is basically no difficulty! I'm just telling you some of my experiences. The key is yourself. I wish you progress in your study.