Hello, if you have to pay for work first, and it is a large amount of 3000 yuan, then you should be careful. Most of them are informal companies, similar to pyramid schemes, because formal companies don't need you to pay a deposit, even work clothes are issued, so you don't need to pay a deposit, so you'd better go to the local industrial and commercial website and the Education Bureau to check whether this school is formal or not, and don't be fooled.

I hope my answer can help you.