As a college student, I can say that the difficulty of advanced mathematics depends entirely on whether you have taken classes or not.

From elementary mathematics to advanced mathematics, the difficulty of the topic is increasing, but with your rich experience, you are fully qualified for the subject of advanced mathematics. Don't think too much about this course.

I still remember that it is difficult for high school students to get high marks and fail easily. However, when I arrived at the university, I found that only a few people failed, most of them were able to complete the compulsory courses for senior students with excellent results, and the teachers would try their best to help you. I hope you don't worry. Of course you can listen to the class well.

There is a saying that the most difficult thing in college is advanced mathematics, but in fact, advanced mathematics is to play a brain trick with you, that is, you have to do a problem repeatedly, so you can believe that the subject is not confident in his concentration and persistence, so I suggest you use other auxiliary means, such as online classes. Of course, this is only a suggestion, and it depends on how far the subject wants to go. If you just want to pass, you can use an online class like Uncle Gao Shu.