I went through several phases when it came to dealing with bullying:
1) letting it happen
2) starting to defend myself even against group of bullies
3) leaving the school where I was bullied as soon as I was able
Probably not the best way how to deal with bullying, but at that time, especially the third phase had been a matter of survival for me, since there was only so many times I could defend myself against group of people who were set on trying to beat me up.