I want to switch from Working Visa and Residence permit to student type

I am currently working in China under a Working type and a Temporary Residence; but i've been offered to study at a martial arts school. They say they need me to have at least 3 months allowance to stay in China, so they can transact the student type on time. I don't know if they can switch my Working type into Student type without me having to leave the mainland. Can you explain please?