Landlord, how old are you Wang Houxiong series is still very good. There are many teaching AIDS in Beijing Normal University Edition. One-year whole school exercise manual, light and optimized championship training, gold medal study plan, three-year simulation of five-year senior high school entrance examination, Qidong middle school exercise book, Peking University green card, etc. They are all good teaching AIDS. Here is a website dedicated to video explanation of teaching AIDS. It's free. It's called Tigu. com。