best efficient way to level up is to find another 3 people and make a static party for leve link every reset.
you need this leves.
30-can get at lv 23
Limsa
Cassiopeia; Necrologos inferno.
Cedarwood; Lightsome verdure.

Uldah
Nanawa Mines; Necrologos; adamantine wills.
Nophicas well; Necrologos ; Levishower?

lv 40(you can get when you are 33.)
Uldah
Broken water; Dunesfolk for dinner*** this one gives best sp with the one below.Currently i just do this one and ranine for sp.
; Necrologos: Ranine Reveries** best one.
;All craked up.++ this one is ok, but not as good as the rest
Limsa

camp iron lake ; Great Hoary Toads

I dont bother with gridania leves as with this ones i already have enough sp and is faster/cheaper on anima.

Basicly when there is 1 mob left you fail it to ensure you get it again next reset.Dont need to get it , it resets automaticly on your log.Only need to talk with AG npc.

That is the fastest and most efficient way to level up atm.