Because since someone asks you, on the one hand, it proves that you are good at math, on the other hand, it proves that he trusts you very much!
If you are studying when he asks you a question, or you don't have time to answer it, you can ask him and ask him to come back later, or tell him that you are not available now and go to him later to explain it to him. This will not hurt the spirit, but also leave enough face for boys. You look so beautiful!
The friendship between students in college is the purest and most unforgettable. I hope you can cherish this wonderful time. In addition, give someone a rose and leave a fragrance!