During the clean, work on speeding up during the second pull, above the knees. You either stay the same or slow down (65kg cleans). You do not want a hitch in your clean, it should be a smooth acceleration!!
On the jerk, get your front foot out in front and keep your hips from sliding forward when you transition from dip to drive!!
Assistance work would be squats (all types), pulls (snatch and clean) and push press. If you have enough energy, push-up/bench and pull-ups, but don't make them a priority over the previously mentioned exercises.