Help with interview/resume

Hey guys! I still have a few months before i graduate but I wanted to get a head start on my resume. I have a couple questions for you..
When you are putting down your education, is it appropriate to just put the college you graduated Nursing from or should you put all the colleges you went to? I went to 3 colleges bc I had to move, but if you don't put them will HR think that you are trying to hide something?
I have seen on here that your GPA will help you get an interview but I thought they couldnt ask about your GPA?? I have passed with a C every time so far but a C is 78 to 84 at my school, and I'm proud of that C, as are most ppl in my class!
Also, I stutter when I'm nervous and sometimes can't get the words out when i am confronted with a question. :/ It doesnt happen when i am working and on an everyday basis but i know i will stutter when I am in an interview! I worry about that all the time, so my question is if anyone has ever worked HR what is the first impression of someone who might stutter? I don't want it to hinder me in getting a job.
Thanks for the feedback in advance, every response will be greatly appreciated!