To score points very quickly,you must first make a point.As soon as the possesion changes,tilt the analog stick(or D-pad) towards the player with the ball and repeadetly press X. If you do this corectly,you should have tackled them and taken the ball from them. Move towards the three hoops and press O to shoot the ball into an open hoop. Do this over and over again and you should have alot of points by the end of the game.