I have always found MOST Thai Embassy and Immigration staff to be exceedingly patient, kind and helpful when treated with the same respect that you would like to be treated.
You get stamped in on arrival for 60 days, you can then extend at Immigration for 30 more days for Bt. 1,900....if you wish to remain any longer, you need to apply for another visa in a neighboring country....
Ok, I assume you are currently in Thailand and wish you luck during your visit to the MOL with the school principle. Do report back with the results, and good luck!
It sounds like anther short-cut course you go through to teach quasi-legally here...IF you have a legitimate University degree, there is no need....Do you have any Uni degree?