If you're not going to study and just have fun all the time, you might as well not go to univeristy.
might as well not .. を使って表現できますよ。
ーIf you're not going to study and just have fun all the time, you might as well not go to university.
「いつも遊んで勉強しないなら、大学に行かない方がましだ」
ーIf all you're doing is having fun every day and not hitting the books at all, it might be better not to continue at university.
「毎日遊んでるだけで勉強しないなら、大学に行かない方がましだ」
might be better not to .. を使っても表現できます。
ご参考まで！
カナダ 
