What school do you want to level? There is comprehensive skill leveling guide posted in the Tips&Tricks group. You should check it out, if you want to level your skills fast.
see i just started and found out the trick with the Spell MUFFLE, my illusion is at 77 and ive been doing this for like 3 hours nonstop..... so i guess what im trying to say is i want ILLUSION up to 100 within the next 5 and a half hours say..... any other spells that would work or not?