You will need a degree and the transcript and it will have to be notorised and a translation, even though English is supposed to be ok. The end of the 1st semester (there are 2) is only a month or so away so now is a good time to be looking but don't expect any income til about the New year.
Some years back I had to do a border run. Was going to be over by a day. A local immigration officer told me to pay the 500 baht daily overstay fine rather than pay the 1900 for an extension. If I remember correctly the 1900 baht extension in this circumstance only gets you 5 or 7 days not 30.