I may have misunderstood a bunch of things from the beginning because they're telling me I have to leave at that point (29th March) to extend the very same Visa from outside the country. I would thus still need to get a reentry permit. The course is sold as 9 + 6 months so the end date will be around September or so.

So I misunderstood it as the Visa ending on the 29th of March but that's actually when, according to them, I need to extend it from outside the country. Does that sound correct, do you think?

So from what I understand there's a limit to how many extensions of stay you can get and according to my school that limit is until 29th March, after which my Visa will expire and I will have to apply for a new one. I'm trying to become sure of that date and also informing myself of any problems that might occur, as they inevitably seem to do.

Indeed, hence why I made this post. I've extended it once before and will soon have to extend again. According to the school my cumulative extensions will last until March 29th when I will have to leave and apply for a new ED-Visa. The course duration is 15 months total, I believe.

I want to be 100% sure of this date before I book any flights. Wanting a second opinion before I commit.