Mine was late 3 months and no problems, all depends on your immigration office but not a worry. Just have the funds in place for the extension & all good.
Why Thailand for an upper university degree, terrible universities here, better to go UK or anywhere Europe. Or if about being poor, then get a “online degree”.
don’t forget, think “tm 30”, Thais love forms. Register your address via the Thai owner with local immigration office. I’m in a non-tourist region so they don’t care but you should check with your local immigration office.