Usually it doesn't sell much money.
However, although some majors are very strong, their professional knowledge is constantly updated with the change of time, so the chances of using them in the future will not be too great ... so it is not necessarily useful to keep them. When taking exams such as lawyer's qualification certificate, doctor's certificate, accounting certificate, etc., you still have to read special exam books, not college textbooks.
If you think that so many books are heavy and it is troublesome to move home, and you think that your future work has little to do with your current major, then sell them.
But if you keep it, you will miss it. Otherwise, there will be no university books in the bookcase at home. Don't you feel a little sorry and lost?
So personally, if it is too heavy, it will be useless anyway. I have no feelings for books, and I don't remember them in detail in my notebook. It's nothing if I sell it. If you feel a little reluctant, take notes carefully and keep them.