Look at your own foundation and workload. I feel that some problems in the case of 1000 are repeated in Wang Houxiong. The number of questions is small and most of them are simple, but the questions are classic and can represent a way of thinking. 1000 case can be used as a reference, not as the only supplementary teaching material if you are very demanding of yourself. The most recommended thing is to do the original college entrance examination. You can buy a whole set of five-year math questions in the gold test paper, and then do all the questions in the country in recent years according to your own weakness (I am a conic curve).