Computers are more the norm, but some profs have started banning computers in the classroom, too. So it might depend. You will probably need a computer for exams, so you definitely need one... But there's nothing wrong with hand-written notes, just you'd probably have to transcribe everything later. Personally, I favor legal pads for notes -- I used them exclusively in grad school, and I used spirals in college.I type faster than I can write, so I would definitely use my computer for note-taking. I just hate having to transcribe and I would rather be able to organize everything on the computer for faster access.
Why are they necessary for exams?