21-30 Free To Play: Crackrocks, Sick Grossewer Rat, Boars, Prespics, Miliboowolfs
Pay to Play: Gob-ball corner - good for sadida/strength use soothing bramble then sacrificed doll Runescape Gold and bramble in between. (eevilhomerr). Lousy Pig Knights and Lousy Pig Shepherds.
Piglet; it's useful to have some magical reduction here until your able to wear a prespic set for piglets. If you know how to do it right, Mushds. Prespics mobs are good way for sram and intel sadida's. Small mobs of 2-3 Biblops weak to your element type.
Crackler groups: Blue, White, Orange and Green Dinks groups at Astrub: Rocky Inlet. 1-4k exp per battle. Blacksmiths (avoid Dark Miners!)
Blops, Easiest with ranged and summoner classes. 6-12k xp each fight. Also try to kill Blops weak to your element. The fight will go by fast.
Vampires need good defenses or long range would help. Monsters at Astrub Rocky Inlet are decent xp 6k for 2 level 15s with full adv set on. As long as you fight the higher groups you'll get alright xp.
61-80 Pay to Play: Moon Island - prespic set is advised; can go custom
Blops - Blyph takes MP, be warned ^^
Vampires or Chafers in the Cemetery
Koalak mobs are hard to find, but XP is excellent
Dreggons: Chafers - be careful, crits can hurt
Gross-ewer Rats with a level 70+ agility Iop
Kanigers are fun and good XP - try to go with a group
Monster mobs in Sidimote Moor