Two things to improve on. First is your jab - multiple jabs you are having some problems with as per my comments on one of your other videos. Fast is good, but correct form is better and will ultimately result in a more powerful and faster jab in the long run. Be sure to pull it all the way back, don't half ass it.

Second, your uppercut - I'd like to see it come more from your legs. Right now I see a lot of arm movement, but you aren't involving the rest of your body. Deliver the first hook and shift your weight to the right and down putting you in a position to launch up and back towards the left (with your uppercut) which sets you up for a more powerful left hook to finish. Right now, it's kind of hard to see a difference between your uppercut and a right hook to the body. I want to see your uppercut travel up from the sternum to the head.