This depends on your hobbies and future development trends. There are many things, and self-study is very laborious. Although it costs a little money to attend the training course, it can save a lot of precious time and is worth it.

If you are interested in something, I suggest you sign up for a remedial class to study. Nowadays, society is full of compound talents. What do you need? Seeing what you want to do and learn in the future will play a great role in your future development. There is a lot of time in college. I hope you can make good use of it and live a full and meaningful university.