That depends entirely on what skill you are raising.
By using the highest level spell you can. Higher level spells give more experience.
Your able to get your attack up fast if you attack and kill animals or people above your level you gain more experience. When I played Runescape I used to do this alot. It's great fun isn't it!
level 138. there is no higher level on runescape (for players)
By fighting. That will increase your levels in different skills, which will in turn affect your combat level. Note that the higher you are, the slower it will be to advance.
hill giants, bank the bones and you'll make money fast.
You can level up fast by training a specific skill and focus on training that skill. Some people like to do mini games for the experience.
The player with a level 59 on runescape s nike26912
killing Moss giants my help you level up a tad bit fast for your current attack level.
Mudskippers are level 30 and 31 on Runescape. The smaller ones are level 30 and the larger ones are level 31.
You don't get it fast. You can get a million in a few days, or if you are very good at RuneScape, perhaps in a few hours.
Unfortunately, you can't get horses in RuneScape.
He is level 81.