I doubt I'll get 3b by end of 2014 but it's something to work towards I guess. 3b will be a big step since I'll probably need to do more of the slower skills as well.
Slayer and combat will get you a fair amount of xp along with charms for Summoning. :d
Xp from Warbands, daily challenges, God statues, divine locations and the thing north-west in Burthorpe that gives like 77k (?) agility xp per month also add up@