The school itself is rotten and useless.

But your salary, that should be minimum 12K + decent living accommodations... that's really minimum.

If I were you and I was offered 18K + decent 2BR apartment + transport allowance, I'd be very satisfied.

Here is a tip, your nationality/race/ethnicity is an advantage in this country, take advantage of it. Bargain for the highest pay the school is willing to pay, trust me, they will accept almost any offer you demand for as long as it's not too unreasonable.