there's a paper form you fill out at immigration, you need a passport photo and photocopies of passport ID page and visa exempt stamp page. Also possibly a copy of TM30 report (done by hotel you're staying at, ask them for a copy). Normally there's a photocopy shop and photo place near immigration.
From memory I believe Kasikorn wanted my rental contract & a utility bill in my name with my address on it. + the document from your school and passport I think should be enough.
I opened mine at the Sukhumvit 33 branch (opposite Emsphere), it's reportedly reasonable foreigner friendly.
only 12k aud & 2yrs wait for that Australian (spouse) visa, plus up to 100 documents proving you're in a legitimate relationship . Marry a Thai and you can get Thai citizenship in a few years as well, if you meet the requirements.
not every instance there's way too much variability, but he does say it very often, as do others. Yet I don't see people say they aren't a requirement. Maybe x border don't normally ask, or a less nuanced response, but no one says that it's not a requirement that can't be asked for
Brandon replies to almost every post of someone with questionable history to have the 3 proofs, I and others have many times too. Not once has someone said it's not a requirement. You'd think they'd be replying here