Chinese should pay more attention to classical Chinese, keywords and translation. Notes in classical Chinese are very useful, you can try them almost every time, and you should also conceive more articles in your composition.
Do more math exercises. Since you want to be in the top three of your class, I believe your grades are ok. Do more finale questions in the senior high school entrance examination and sort out the questions once a week.
In English, consolidate words, because it is relatively simple, so I think you can accumulate a lot of good words and sentences, but be careful not to be too difficult, in case you forget or make mistakes in the exam;
I think physical chemistry is the most difficult. It will be helpful to do more exercises, turn over the wrong questions, ask if you don't understand, and look at the middle school questions more.
As for political history, if you open a book, you must read more books and be very familiar with the contents of the book. Which page is the answer to which question and what notes are there. When you see this kind of questions, you must find the corresponding page number, so as to minimize the waste of time and improve the efficiency of doing them.
Well, the most important thing is that you should persevere. Since you want to compare with the top 7 in the past, you must work harder than them! Come on!