What problems might I face when applying for my new Ed visa in Bangkok after struggling in Laos, and how can I avoid them?

Hello all , So I’m in Thailand was on a Ed visa (for a language school) decided that I would like a degree joined a university but struggled getting my new Ed visa in laos left without cancelling anything was told it wasn’t necessary.Been struggling with the TM30 moving into a new place at the end of the month to sort that out . What problems could I face and what could I do to avoid these problems doing the visa directly in Bangkok ?