Check out this post I made about fasting and college.
It’s an individual experience. I’ve seen several people on here mention unresolved brain fog or lack of energy while fasting. Personally, I study in a relatively intense field and I am 11 days into an extended fast without any issues.
I did several 1-2 week fasts while in university. The first 2 days or so were difficult. After that I felt much more alert and actually felt that I performed slightly better.
I have chronic trouble staying awake in class or long un-engaging work meetings. When I was fasting, I never have a problem with that.
You could start in the weekends and see how you are doing, but honestly my biggest hurdle was social/roommate pressures. People wanted to go out, go to dinner, make dinners together, as well as the smell of food twice a day in my apartment made it the most difficult.