The preliminary subjects of communication and information system major of Beihou University are11ideological and political theory, 220 1 English, 330 1 mathematics, and 4803 information and communication engineering. Advanced mathematics is divided into 30 1- Math I, 302- Math II (the best one is chosen for science and engineering, and different schools have different requirements) and 303- Math III (the choice of economic management). In addition, there are 3 14- mathematics (agriculture) and self-propositioned physical mathematics (subject code is 60 1-609) 803 reference books: communication principles, Beijing University of Posts and Telecommunications Press, 3rd edition, Zhou Jiongpan, etc. Introduction to Signals and Systems, Higher Education Press, Zheng, March 2009. It is difficult to simply say that it is difficult to take the postgraduate entrance examination. Postgraduate entrance examination mainly depends on scores and competitors, and the key is to accurately locate according to your own achievements. As long as you have the strength, you can prepare carefully. For your reference, I hope it will help you.