I think it isn't very useful for study.First,teenagers cannot live by themslves very well,so they may have some troubles with their everyday lives.These years,a child can be either very good or very bad.If they haven't got good effection from their parents,friends and others,their lives can be easily destroied.It will never be late to study,but no one can get his childhood the second time.
That's all.
五分钟内编的,凑合看吧