just need a straight answer,

If you get a PUBLIC school job in china, AND they say no office hours etc etc and they say its 18-20 hours a week, am i right in assuming that i only need to work that 20 hours

because a private school wants 40 hours out of me

Now the problem is im still doing my BA degree externally, so i need all the time i can get to get my degree done, ie. i dont want to be working 40 hours and not getting the time i can get to do my BA.

but the only school i can find that will hire me as a teacher with no degree yet in the public sector is about 4000rmb a month. i dont spend at all really, so u think this will be 'sufficient' to live on? considering im not going to be totally wasted every night?
THanks all