Vientiane is easy but it’s 1 ED visa every year.

Did they give you a reason?

You’ll have to let the school know that reason so they can also avoid this in future.

Print off the pdf that it generates as long as it has your name on it and the equivalent amount you’re good

You can show statements in Revolut

airbnb is not illegal if the host has a hotel/guesthouse license or renting more than 30 days

Show them the receipt/proof of payment and should be ok

if you’re studying Thai.. fill in your arrival card in Thai. Proof of study 😉

Let the school know of your travels too. So they can get extensions for you. Usually it’s ok for short trips.

You should always have a general plan for what you will do for 30 days in Thailand just in case. And also a plan for leaving when your exemption is finished within that 30 days.

BUT You won’t be asked anything by immigration unless they suspect something. That’s where your plan comes in.

Your airline will most likely ask (particularly budget airlines) about your plans if you are on a one way ticket. Sometimes they won’t even ask for proof and just accept what you say (see the plan part)

Sure you can try updating and see if they say anything like “sorry already done”

Chiang Mai no you don’t. Only update if you leave the country (no need to do a new one)