I will post this here as well. For starters this game is for the most part easy and simple once you understand how it works. With that said this is the best solution I have found. To avoid the frustration of the boosted stats of the A.I. in season 3 and the possibility of having to completely start the career over. Here is what I did.
In the first season after the tutorial get 2nd place in the very first race you do. Then choose to continue and NOT to restart race. When you continue you will be given the chance to apply stat points (always upgrade SPEED and STAMINA in season 1). After the points are applied and the game saves you will the choose the race you placed 2nd on and continue getting 2nd or 3rd even, to the best of your ability. Hitting continue and applying stat points yet again. Once you feel you have done enough stat boosting continue through the season competing in every event and having 1st on all of them. Do all the annuals you can to boost them up even higher. Also heard second place will work here as well for raising the stats.
Once I finished the first season I had speed and stamina at least level 3. At this point I kept leveling those two and started putting some points on turn and a few points on dive and finish. Then went on doing everything I could and anytime I placed 2nd you guessed it continue and boost them even higher.
When I went into the third season speed and stamina were completely maxed and turn was at least five, the others being two or higher.
Doing this will take a bit longer than the 3 hours most say the game can be done but take my advice and play this safe or you will be spending more time swimming harder opponents. Have fun and hope this keeps you from playing this thing through twice like I and many I know had to.