There is no need for a second-level constructor to hold a training class. It is not a problem for him to study hard. I took an examination of architecture last year, with an average score of 2 1, so I read it myself. . Read at least one book and find some information about the remedial classes casually. There is no need to spend thousands of dollars. . . Just remember to read this book carefully. Don't think that you have rich business knowledge and don't need to read that book. In fact, they are all such people.