Go to the bandit camp and train on bandits,but bring a god item if u want to AFK.
By fighting.
That is impossible. I takes 72 hours strait.
the highest level in runescape is 138 now. you need 99str, 99def, 99att, 99range, 99mage, 99prayer and 99 summoning.
a pring works by helping u get 99atack 99hp 99str 99def in 30minutes instead of taking u to get all these stats 99 in 3hours