Let's just say that no one can tell you. Why? Quite simply, this kind of thing can't be done in a few words. I think there are several ways to help you solve the problem indirectly.

First, recommend basic books and work hard.

1- Mathematical Olympics mini series, commonly known as mini blueprint, a set of books is the best book and a classic book.

2- Junior high school mathematics problem-solving method book, difficult to combine.

3- Olympiad Classic Series, a must-have series for playing games, absolutely classic!

4- I realize you're asking about geometry. You can look at the cheats of geometric auxiliary lines that you have learned and thought about. This book is difficult and easy, and it is also very good. Absolutely understandable. Compared with the previous books, it is simple, but it is a competition. Can you effectively improve your level in a short time?

Ok, I hope you can adopt by hand. Remember, you must stick to it, otherwise it will have no effect.