Jiangsu Secret Volume can be selected as a difficult textbook for Soviet education. Practice for five or three days every day, Jiangsu secret volume, Jiangsu Education Publishing House published the "College Entrance Examination" are all good. Jiangsu dense paper has a large number of questions, good quality, difficult questions and better results. Different teaching AIDS are different in difficulty, some are difficult, and some focus on the basics. We should choose teaching AIDS according to children's learning situation.