@Bra****
you are indeed possibly the first person who entered on a new tourist visa, went thru quarantine and converted to an ED visa inside the country for attending a private language school without paying the "special fee" (read under the table bribe money) to get that visa issued.
You'll find out in 14 days whether it flew or not :) They stamped on your blue-green receipt paper the date you show up to get the "results". The up side is I have never seen someone in section C-1 apply, pay, get a return on xx date receipt be denied. BUT this whole above the table in country ED visa for private schools is a new thing. Sincerely good luck, report back and let us know how it goes