It is very advantageous for the mathematics department to cross-examine the economics department. What you need to do is to rationally determine the target, that is, the school to be tested, and review according to the test books designated by the school. As for English, mathematics and politics, there is no need to worry about the national unified examination, mainly specialized courses, which should be reviewed in a targeted manner, because the specialized courses of economics are independently proposed by universities.

PS: Actually, it's not very difficult to take an economics postgraduate exam. If you have enough time, you can read more relevant economics textbooks, which will help you analyze and master the knowledge. If time is short, as mentioned above, you should review the outline in a targeted way. Good luck ~