Let's talk about the hard part first! I think no matter which school students talk about operations research, there is no one who doesn't say it is difficult. I don't know how difficult it is to teach this course in our aviation institute, but as long as you take the postgraduate exam and take the management science and engineering major, most universities in China will definitely take the operational research exam. So from what I have learned, operational research is really not so studious. However, it's not invulnerability, it depends on whether you work hard or not. Take linear programming for example, you have to draw many tables. If you don't have patience, it is estimated that it is difficult to gain anything. When studying, I suggest that you must listen carefully in class, because the things in the book are too abstract and difficult to understand; The teacher was more specific. As long as you write it down and watch it after class, you can generally understand it. Don't be greedy when you do a problem, because there are many ways to write a problem. If you do too much, you will lose confidence because the questions are done slowly. Choose a few topics from them, study them thoroughly, and you will often gain more, because your main task now is to get started, not to rush for success.

Except discrete mathematics, we must not be confused by its name. In fact, discrete mathematics is not very discrete, because if you are not a computer major, you will never learn this course in depth, just get started. So everyone must not be afraid. We should pay attention to such problems in our study, and we must read the topic and scrutinize it repeatedly, because I find that one of the major difficulties in discrete mathematics lies in your language ability, that is, your ability to understand sentences; Furthermore, we must follow the rules to solve problems, and don't be unconventional, because many problems, if we don't follow the rules, it is easy to miss some situations. Moreover, teachers don't like to look at irregular answering methods, which will increase the difficulty of marking papers. Everyone must pay attention.

This is my experience in these two courses, for your reference only, I hope I can help you!