Anonymous participant No requst for tax returns. I think they only ask for that information from people going the workcation route.
The school is
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They do offer a "Visa Support Package" for an extra fee, but doing it yourself isn't that hard. I did it myself and was approved in under an hour.
If there are questions, etc on the visa application you aren't sure how to answer just come back to this group and do a search. There aren't many questions that haven't already been asked and answered.
I got my DTV approved through Los Angeles via cooking school. I believe the consulate's website says $16k USD, but I provided them 3 months of savings account statements of $17k with the statement dates and ending balances highlighted. I also provided a cover letter detailing what the statements showed (ie)
"Hello - please find attached savings account statements for the past 3 months showing balances in excess of the amount listed as a requirement.
Statement 1: for the period ending May 31 with a final balance of $17, 017"
You get the picture.
As for muay thai school, make sure the school has had success with DTV applicants out of the Los Angeles consulate. If there is one thing everyone dealing with this stuff has come to understand it's that not all embassies & consulates are the same and what one accepts doesn't matter to the others. Good luck!