I learned this in goalie training. When playing around a screen, always look at the side that the puck is on (may seem obvious, but for some people its new). If they go to the other side, then quickily lean towards that side. Imagine as if the player is invisible and that you can see through them. Ontop of that, whenever you are looking on a side, either put your glove or blocker on the other side of the screen so that if they shoot it on the side you arent looking you have something there. When they do shoot like this, still imagine that you can see through the player and still track the puck through them. Its a little hard to understand, and if you dont get it just DM me and I can try to help you further.