You have been awfully fooled by your school.It takes no longer then a week to get paperwork for your initial 90 days Non-b visa. And most of this time takes a letter from a local education office.
Thank you for warm words. I prepared completed applications for both consulates, copy of passport and TM.6, air ticket back to my home country, travel itinerary, original copy of Thai bank book with 25K and 20k in cash. Hope its enough.