Hi Laura , I can answer for you !
대학교에서 들어요: ~ 에서 means " from" or "at". for example, I take the Korean class at the college. this means "나는 한국어를 대학교에서 들어요."
대학교를 들어요 : This sentence looks a little bit weird. ~를 , or 을 usually after object.
For example, I see the book. ( English case : S + V+ O) and if translated in Korean
Korean case : ( S + O + V) so .. the sentence can be 나는 책을 보아요. ( 봅니다.)
나 ( I ) + 는 ( one of the particles a) 책 ( book) 을 봅니다(see).
So bottom line is that 대학교에서 들어요 seems to be better. Or if you can provide more information before or after the sentence and then we can find right ones !
I hope this is helpful for you!
Thanks and good luck !