Basically, what you want to do when you are jungling kha zix is: you want to use you're w to clear the early jungle waves. I know people say that you need to give the lane the kills but I believe that if you take a few kills out of the lane when they can spare them, then it will make your jungle much faster and your ganks stronger. When jungling with KHA try and set yourself a clear limit before you would gank, for example, clear everything oncem then do wraiths again before you would gank a lane. When you are ganking a lane, if you can save your leap to try and secure a kill that is further away, remember and use your spikes for that vital slow and use your q as much as you can. Your ultimate can be used to increase your movement speed to approach the lane faster, and the invisibility will cloak your approach. You can also use it as an escape plan if a gank goes sour or you have to tower dive. I know these sound like the basics but having a plan for clearing and ganking lanes is key.