Jungling effectively is all about reading the enemy jungler's movements and forseeing the next objective.
Having good macro knowledge is key to consistency. Which lane is shoving, whichisn't, where is their jungler going and why? Are they preping drag? Are they grouping mid to siege? Can I trade another objective for it or should we countersiege? Is this objective priority or should I headto that one? Why is the enemy mid laner pushing so hard all of a sudden? Preping a dive? Being careless? Is he feeling safe with his jungler being around?
Truely, what got me hooked on jungling in Season 5 was that the role wasn't about just trading blows and last hitting. There is a true strategic feel to it that kinda reminds me of chess. Gotta predict, and adapt to alot of things.