I'm struggling to understand this sentence. It's in an answere [here](https://www.zhihu.com/question/48971187), about halfway down the page. I've copied the context below:

> 
> 一部分是课代表。我是语文课代表 也很喜欢语文老师 他忘了留作业的话 我就在座位用口型告诉他 作业。然后他就
>  噢今天的作业啊，巴拉巴拉。这样可以避免我去办公室问作业 作业总是要有的啊。 一部分单纯热心。**而且想提前写作业 不留到晚自习就写完多好**。
>  最少的一部分是自己从来不写作业 但不能让别人没有作业。这种可能很小。
> 
> 
> 

Anyone able to help me out with this? I'm HSK5 so I know the general meaning of the characters in the sentence but I can't figure out the overall meaning. Thanks in advance.