I'm not happy

In the China, students have many a lot of homework.  They don't have free time on the weekend.  They must to learn Chinese, Math, English, Physics, Politics, Geography, Biology, and History.  They don't have friends [1].  They don't have partys parties.  They just have classes, teachers, notebooks and their homework!

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[1] I think you mean, "They don't have time with friends."

Please add a space (' ') after every comma (',') and full stop ('.').

你好， 你该改 partys 成为 parties; class,teacher  成为 classes, teachers 来表达你自己有很多课程，每个课程也有不同的老师. 还有, 没有 must + to V， 而是 must + V => Must learn. 

只在帮你改改， 没什么意思，希望你快完成功课吧！ 很高兴如果可以啃你交个朋友， 谢谢! 晚安 ^^