How do you thing about your college life?

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I have study in university for about 2 years.In the university,I learned a lot of things,make some friends what's more I feel that I have became more mature when facing with some problems.But now I must make a choice that whether I should continue to study hard to get high marks,or just give up some efforts studying my own subjects,and spend more time on other skills.Beacuse there is a tendency that many of my classmate do not focus on their subiect,feeling it is useless. What should I do now?