The official didn't ask which books to use, but if you want to take the civil service exam, you still have to apply for the exam and take the exam over the years. Doing real questions will be of great help to you in the exam. As for other reference materials, the landlord will go to the bookstore by himself, and don't always make a series of books, because each series of books has its own characteristics. If you do more, you will find that many books in the same series will have the same problems, because they are put forward in a question bank. This is my experience. I wish the landlord success in the exam.