Look at the purpose of your purchase. If you just want to practice the simulation questions simply, you don't need to explain. I suggest buying 38 sets of Tian Li. If you want to look at the explanation of the general review, the targeted training questions and do some relatively new questions, I suggest that you simulate the college entrance examination for five years and three years on May 3 according to the questions, which is very targeted. Moreover, the answer analysis of the five-year and three-year college entrance examination simulation is very good in the current teaching AIDS. The only drawback is that the number of questions is slightly less than that of books that are simply practiced.