I am in Shanghai and my tourist visa will expire in 10 days.

I have a letter of enrollment from a school (6 months) that allow me to apply for X2 visa, but I have to go to Hong Kong for that.

As the airfare plus hotel is expensive at thé moment, i need to ask for express, on 2 days.
The agent from thé school is asking 2400 yuan.
Is that normal?
Do you think I can manage that on my own?
Thank you