Conflict of college and prayer time

I have a problem.. I have to go to college at lets just say 6pm-9pm every weekday. And we can assume magrib is at 6.20pm and isha 7.20pm.. I can come back and do Isha prayer but how can I do magrib prayer.. Can I do it before going to college or can I perform it after coming home? Can u tell me what I should do?