Easy level ups in runescape:
Go to Rimmington, then go to the room where two logs respawn. Go in it, close the door, then wait until the little level 2 rats respawn there. Kill them until you reach level 5, then go back to Lumbridge. Go to the room with goblins in it. Close the door and wait until they respawn. Kill them and level up to about level 10. Then, go to Varrok and kill any level 9 men and level 10 muggers until you level up five more times. Then, go to the Wizard Tower to level up to level 20. Continue with the higher five levels each time until you are at level 40.
An easy way to level up in your ranger level is to go to Port Sarim. Go inside the jail. Note: You will not be able to get your undamaged arrows again — bring a lot of them. Shoot at the goblin first until you gain some levels, then kill the mugger followed by the thief, black knight, and other prisoners. You will level quickly. Another place of interest for rangers is the wizard tower. Go down the stairs until you cannot proceed further. Look for the lesser daemon that is caged up. Note: Once again, you cannot get your arrows back. Also, beware of the level 25 dark wizard with a beard who will attack you.