My best advice to improve your hand coordination is first to learn everything in your right hand, then learn everything in the left hand and then when you combine the hands, play extremely slowly. I mean really, really slowly. Just one note at a time. It’s just muscle memory. Suddenly you start to be able to play things together and then you can slowly increase the pace you’re playing at and then suddenly you’re able to play at the original pace that you’re aiming for.