What are the best Thai language schools in Bangkok for an ED visa and what should I expect regarding costs and immigration approval?

I studied for 4 months at

@RTL-S*****

and was at a conversational level. I then used the skills I learned there and became fluent in a year.

It's a great school and they have both private and group classes 5 days week. They help you with the ED visa if you study for a year.

Duke Language School is top notch. They have their prices on their website so you can get an idea, and they offer discount for multiple months if paying up front.

You can read the reviews to get more information, but you really can't not learn thai there, it's very thorough.

Royce is also super responsive to any questions you might have if you email them, and they have multiple front desk staff that speak a variety of languages to assist with anything.

They will give you all the documents you need and you'll take them to immigration. As long your school has a good reputation, there shouldn't be any issues. If the school believes you're not taking your learning seriously, they will not provide you with the documentation for your extensions (must extend every 90 days), because they don't want to hurt their reputation and you'll likely be quizzed some basic questions in Thai when you go for extension, plus at some point there is a Ministry of Education exam.

Duke is considered one of the best schools. I attended ALA. The school will help you get the visa, processes vary through. If you go to a good school and have never used an ED or any problems with immigration in the past, I am sure you will be approved for the visa with no worries.