发一段英语作文,是有关学生上补习班的,请帮忙查下错(仔细)

错误都改了，还改了一些不地道的表达，你再看看
I think It's effective to take the extra classes,only if you are interested in and don't do well in some subjects.Otherwise you'll waste time and money!And I think the most important thing is to have enough rest,do not bring yourself too much pressure!

I think it's effective to have remedial classes that you are interested in but can't do well in them. Otherwise,it will be a waste of time and money. And I think the most important thing is you must have much free time, don't make yourself under pressure!