DO you still keep up with your classmates and how are they all?

No.
I spent only half days in HS my senior year, and most people never even took 5 mins to talk with me even when I was clearly going somewhere, or even ask what I was doing. lol
I did talk with a few people, but my studies were beyond what they were doing in math, science, programming, history, econ...

I have had occasion to see a few. I wish them well, regardless.