Hi, I’ve read your idea and you did ask for feedback, so here it goes.
Your idea could use a little shaking up. You have a lot of fairly overdone fantasy tropes here, and you haven’t really talked about how you’re going to overturn or subvert them.
A teenaged orphan with a mysterious past who was dumped on the doorstep of a stranger (presumably in a wicker basket with a cryptic note attached) who has to leave his/her rustic village to go to magic university?
If this is satire, your opening is completely on point, but if not you’re in trouble.
I would suggest you go back to formula and try to talk about how your story will be different from accepted fantasy tropes, rather than which ones you want to embrace.
Maybe take a look at threads like this:
To get an idea for how to switch things up in your own story, all of those ideas are informally agreed to be free-use ideas, and you have my permission to use any of mine.
If you want any idea-help at all, feel free to PM me or just ask here, as you will soon learn I have a pathological inability to withhold my opinion, so that’s my problem.