At the begging of a season you get 10 new drills. Before you start your new drill, subtract on point from you 3 point stat, which gives you around a 1000 skill points to spend on anything else, then complete a shooting drill by attempting only 3s to get your 3 point attribute maxed out again. This is a simple way to get extra skill points. You can do this anytime you get a drill.
Enter the following codes by choosing "Features," "Extras" and then "Codes."