Get through the Forbidden Forest
If it works correctly, the pattern for it is left twice, right three times, left three times, and right three times. If it is done correctly, when the car takes the last turn before you have to go left or right, go the opposite of the way you turned. i.e. when you are at the last turn, before you have to go left or right, go the opposite of that. The best way to get through the forest is to watch the road. Spiders will appear on one side of the section. When the intersection appears, chose the arrow pointing to the side that did not have spiders on it.

Easy way to get to the Chamber of Secrets
Insert Disc 2. At the beginning, highlight the "X" at the bottom left of the screen. Then, press Up and you should see an arrow that points to the left.