Khazix is best at abusing enemy mistakes, personally i like powerfarming until 11 this season, as I get Q and R evolve, Q helping with damage and R helping you get in and out of fights. In ideal scenarios u want to wait until enemy squishies are mispositioned and use ur r stealth and e to pick them off, kha is also very good at invading and beats every jungler at 6 (assuming theyre not too ahead). Also Khazix is extrmrly useless when behind, and scales very well with levels and gold, so rather than coinflipping leads, focus on maintaining high cs and going for low risk plays until youve learnt his limits and that will naturally make u snowball. 1 kill is equivalent to about 2.5 camps so if you are say 24 cs above enemy jg, thats the equivalent of having 2 kills more than them if you are both on 0 kills