Some of us (like me) have issues with taking notes in lectures; so the OP may get given a note taker. You have to remember it's a spectrum; so the OP may get different equipment.
As for telling people - it's up to you. For years, I know (because he'd told me more than once) that one of my friends suspected I had it. I emailed him for advice. I had to tell him that I'd now been diagnosed. He replies and says "I can't say I'm surprised. I've known you for 9 years. It's always been obvious".
I also found myself in the situation last year where I had no choice but to tell one of my friends. There was a misunderstanding over something (one of my problems is how I understand language) and it was getting to the stage where I really had no choice but to say something. I had a serious problem - he's much older than me. He'd previously mentioned that before retiring, he was a teacher. But he'd retired in 2000 and because he'd taught 6th form, it probably wasn't something he'd come across before. I emailed him. I apologised andexplained my situation. He replies back and tells he that he kind of knew. Or rather, he told me he knew I have problems communicating and he didn't explain himself that well either.
You will find, as I have, that a lot of people would have worked something out. I mentioned in another some time ago that I'd overheard a conversation between 2 people last year (2 people I know fairly well) debating whether I do indeed have Autism because I'm the only one in that group with the ability to remember things. I went a bit red and was hoping my friend (the one I told who had retired as a teacher) wouldn't say anything. And he didn't.
One thing I've found to be quite strange is that people who really should know better, (ie, people who work with people with Autism and people whose children have it) have sometimes either questioned my diagnosis or told me that because they / their child can do things, I should be able. It's called a spectrum for a reason. I've also been told that I can't possibly have Autism and it's "just" anxiety. As a female, I present differently and like many, I tend to hide issues I have.