If levels are your problem, you need to figure out paths. Remember which camps you just cleared, and in which order they will respawn. If you intend to gank a lane soon (let's say top lane), you want to do the camp closer to it's opposite lane then do the other two and work your way to the gank.
Example, you just backed but you want to gank top, but your laner is pushed up. Go do wolves, gromp, then blue, and walk up to their lane. By this time the lane will have reset and you can gank easier.
What I said probably sounds a little confusing, but most of jungling is timing. You have to play enough jungle to start to get a feel for when camps respawn, or how long it takes for a lane to reset. Eventually, you start to have a cycle of farm, gank, invade, ward, objective, etc. (not always that order).
So, if you play a farm champ like Shyv, you might clear top side, then bot side, gank bot, then do drag. But if you play an early game champion, you might go straight to bot lane and do a lane gank. After that, you might decide to take tower. Everything is decision making and knowing what to do next. It takes practice.
Making the right decisions quickly means less time moving around more time doing things. This is what makes you be ahead or even in levels. Optimization is key.