To max out your stats, during the week of a game when you are on a game day, select the game. You will get the option to play or sim the game. Go back, then go to the Performance Institute. Go to whatever drill you can. Keep repeating this process until you have the desired attributes. Note: This will decrease your stamina. The best option is to turn game fatigue off. Note: Stats do not completely carry over to the next week, and if you simulate your games your performance will be affected by the weakened stamina. Turning off game fatigue only works if you actually play the games.

You can increase your Overall, Awareness, and Stamina in Practice mode by having your superstar get practice points by getting a big gain on offense or creating a big loss on defense. You also can get your stats up by getting an agent that has access to the Performance Institute and get a medal on it:

Bronze: 3 points
Silver: 4 points
Gold: 5 points

Note: Your stats are not permanent. They will be reset after each game. You must do the practices and Performance Institute again to get them back up.