There's been a lot of stuff said about the actual work side of classes already so I'll just chime in about the "passing" part
I decided to go back to college as an adult after dropping out twice. I've always been academically gifted but I had crippling social anxiety and just couldn't handle it.
I started college (again) when I had only just started testosterone. I was a few months away from turning 23 while all my classmates were 16/17. I just decided I was going to go in and be a guy and tell nobody about my past. I didn't "pass" and I'm still now in the androgynous zone in terms of how I look.
Many people did think I was a girl at first, I corrected them, there was a slight bit of awkwardness, I just laughed it off, saying I get it all the time because of youthful good looks. After correcting people I never got misgendered. I'm now in Uni, a bunch of people thought I was a girl at first in that class too and I just did the exact same thing.
Nobody has mentioned my voice now being lower or any of the changes I've had on T. I've taken time off to get top surgery and hysto and all I needed to say was "I'm getting surgery and I'd prefer not to discuss the details" - everyone has respected that. I think in regards to the changes they have probably not noticed because they see me every day. For all I know when I'm not there people sit around going "Hey is it just me or did he used to look and sound a lot girlier at the start of the year?" XD but I've not experienced any vibes or hints that people are gossiping about me or treating me any differently. I decided to disclose my trans status to a guy I ended up good friends with, he was totally cool, hasn't misgendered me or treated me any differently since.
So I guess the point of all that was if you feel like your school life will be easier for you if you can just be yourself and not present as a girl then you totally can, despite how you look. You just need to own it. You know your own gender better than anyone, they are in no position to argue.
