you can set up a Nightmare Zone scenario where you can AFK train for 20 minutes at a time. Using an imbued magic shortbow and amethyst or rune arrows is the usual way to go. You'll also need some super ranging and absorption potions...
Train Slayer from level 19 to level 20 Shield of Arrav Varrock Unlock: Varrock Museum Kudos 36 Crafting 36 Mining 24 Slayer Varrock Bone Voyage Varrock Increase your Mining Skill from level 36 to level 39. Watchtower 33 Magic Yanille The Giant Dwarf 34 Magic 31 Firemaking 36 Crafting 39...