1. People who are good at math have an advantage in taking the test of communication, and the difficulty is not too great. They focus on reviewing specialized courses and mathematics, and generally take one exam.

2. After it passed smoothly, it won the favor of teachers because of its good mathematical foundation in programming and algorithm improvement.

3. The principle of signal and system and communication is generally tested in the initial test, and some schools also test digital signal processing. For specific specialized courses, please refer to the school you want to apply for. Generally, the school will specify reference materials. You should check and inform the website of the school you want to apply for. For example, the textbook Communication Principles of Chongqing University of Posts and Telecommunications is redundant.

You can buy a math review book and do it at least twice. Read books for specialized courses and after-school questions, and buy reference materials from your own school and real questions from previous years.

5, in fact, the specific direction should be chosen by your tutor after you pass the exam. You may not know what you will do then, but the comparison between the two is signal and information processing and mathematics.

I wish you a smooth postgraduate entrance examination.