It's a dilemma, if you dont pay, you will never pas the test. If you pay your master, then you feel like being looted, but I do think you pay too much.

I gave my master QR200.- only for 25 days course, and he taught me all the tricks to pass the test and I pass on the 1st test ..

Since there is no strict laws regarding this looting, we just have to decide win win solution for our own needs, you pass your test and the master earn some money for his food (consider that as your "sadaqah")