If you were【were改为are,解析：由后文可知,整篇文章都是一般现在时】 getting a diploma to study ,you wouldn‘t study a lot of useful knowledge and skills when you enter to 【去掉to,解析：enter为及物动词,后面直接加名词,之间不能加to】the college.At present,many a student is doing 【此处加上in,解析：in this way,意思为：这样做】this way.But,someone think 【此处加上you,解析：这里缺少主语you】should develop in【去掉in,解析：develop为及物动词,后面直接加名词,不能加in】 interesting things in yourself.For example,playing basketball,it is good for your healthy【healthy改为health,解析：在介词for后面,只能用名词health】 that【that改为if.解析：根据意思,这里是条件状语从句,需要用if(如果)】 you are able to stick to it with your determination.overall,in my opinions【opinions改为opinion,解析：in one's opinion为固定搭配】,first,to make wIth your classmate,the more friend【friend改为friends,解析：由于被many的比较级more(更多)修饰,所以应该用复数】 you have,the better you will do something .Second,you’d better study many【many改为more,解析：根据句意,这里应该用many的比较级more】 knowledge and skill【skill改为skills,解析：skill为可数名词,前面由于被more修饰,所以用复数skills】.
对你有所帮助的话,