It would be efficient to do dailies until you hit 200m at least. As for other skills, it doesn't really matter.
WC: Divine yews (burth at reset) and mazcab supply run or w/e it's called. ask for wc locations in "minigames" fc. Extend yews. Both should be around 400k xp per hour.
Cache: about 700k div xp per hour if you only do the cache, or 300k if you also do the 20 minute boost. Do the boost if you have time.
Daily challenge: Rune ceremonial swords is the most efficient one (smithing). About 1m xp/hr https://www.youtube.com/watch?v=IB8E_fUgDaE
Jack of trades: about 48k xp a day if u reset the aura. Use the lamp on rc or div imo. https://www.youtube.com/watch?v=pdTM9H1OhJE
Warbands: Try to get into a loot fc (look on forums). Prioritise mining, then smith, then con. or mining then con if you are poor. 360k xp a day
Book of char: Best firemaking xp ingame. 233k xp in 3mins 30 secs at 1.5gp/xp https://www.youtube.com/watch?v=f-CV-4SinrA
Sinkholes for dg xp.
What you should do right now imo:
Finish your combat skills with augmented gear, so you can finish invention as well.
Melee: Airuts or afk abyssal demons with aggro potion. My airut setup: http://puu.sh/nrgV5.jpg
Swap the tetsu with torva. Aggro pots should work fine if you don't want to spent gp on cballs. Looting on an alt with area loot is #1. Aura rotation: brawler ->vamp ->penance
Range: Chin abyssal demons with aggro potion https://www.youtube.com/watch?v=0499fCAj8-c
Mage: Airuts https://www.youtube.com/watch?v=nLQy3QsIUm4