I understand the trouble concentrating thing, as a student, but I personally have far more difficulty concentrating when I do drink!
I had a short day of school so I had to plan to stay busy afterwards. I went to the store for a few things, made an appointment to have my vehicle inspected, I got some cleaning done, then sat outside to study.. so far I have chatted with my neighbor, texted a friend and got on here. I am enjoying the beautiful weather anyway.
I have an 8pm newcomers open discussion meeting. So between now and then I'll chill outside and maybe clean a bit later.
Cooking is a good thing to do to fill up your time.