Junior students wrote a paper and sent it to arxiv. Why does the teacher want me to delete it first?
I don't know your teacher. It's really good to publish papers in universities, which has great advantages in both academics and research. But I went to Baidu, and you're not talking about the place where China officially publishes papers. So I can only suggest that you ask what the reason is, whether the teacher wants you to submit your paper to a better magazine or something.