I do not PK. Never have and never will. So you will not find tips on how to PK here. There will be tips on how to avoid getting Pked in the Miscellaneous Tips. In truth, I have never tried to get combat levels just for the sake of getting combat either. Again, I combine my training with other skills in mind. If I want to finish off an attack, strength, or defense level fast, I usually go to the Dagannoths in the lighthouse dungeon, north of the waterfall - because I also want the great herb seeds they drop - irit and above!
The maximum combat level in RuneScape is 126. The way to earn a combat level is to work on attack, strength and defense, hitpoints, prayer, ranged and magic levels since all add to combat. These tips will not deal with being just pures, mages or rangers. These are tips that can lead to high combat, high scores, and high skill totals.