If you study math, you have to work hard for two months. First you need an outline and real questions, then you need a reference book to sort out the knowledge structure and increase special training. , such as Chen Wendeng's big brick.

Plan in detail, plan every day, have purpose, and have something to overcome every week. I feel that if I sort out my knowledge and carry out special training for one and a half months, I need at least eight hours of efficient review every day. In the other half month, I devoted myself to solving real problems and simulation training, checking for leaks and filling gaps.