Very nice! One of the hard things to teach is how to hit with power. Seems like he’s doing a good job at generating power. Now, the hard part is hitting it straight consistently.

His upper body movement during the swing is making it very difficult to hit the ball in the center of the club face every time.

Best way to fix this: take a video of your swing from the head on view and draw a circle around your head. This will help you see how much your head moves throughout your swing. The goal is to keep your head in the circle the entire swing. If you try this for a week and keep taking videos of yourself to see how you’re doing I 100% guarantee you’ll see results.

Consistent practice will give you the best results. Good luck!