Use the following glitch to be able to max out your MyCareer player's stats and skills without actually needing the skill points necessary to buy them. First, make sure you are signed off from Xbox Live. Then, create a character, and go through the Rookie Showcase and everything that follows. Once the season begins and you have earned 500 SP (should take approximately 2 to 3 games), buy the "Ray Allen Signature Layup" from the store. You should now have a negative amount of SP, allowing you to max out your MyCareer player's attributes and signature skills.