Read the math textbook first, brush the classic questions through online search after class, then go to Zhang Yu 18 to talk about high numbers, Li Yongle line generation and probability, pass it again, then brush the questions of Tang Jiafeng 1800 and Zhang Yu 1000, then listen to Zhang Yu's intensive class, and pass 18 to talk about modernity for the second time. Then I brushed Zhang Yu's real questions for 30 years, starting with 88- 15 for the first time and 15-88 for the second time, leaving three sets of questions. Finally, I bought the last eight sets of Tang Jiafeng and the last eight sets of Zhang Yu, and the last four sets of Zhang Yu are more difficult. Just have a look. If you have poor understanding, you can only talk about sea tactics.