Hello, please don't be impatient in this situation. Sometimes you have too little time to do math after class. You do math problems in Dobs to brush the original questions, not to find feelings. Allocate time reasonably in the exam. When there is little time, don't worry, read the topic patiently, because this can save some time waste caused by misreading. You can put aside your problems and do everything you can first. As for reference books, I recommend the perspective of five-year college entrance examination questions.

thank you