To complete the final
class (A class) easily, go to restart the game. The
car body design that you had used for the A class
races is the same, and not back to normal. All the
parts, accessories, wheels, shape, and body parts are
all the higher class parts. If you made a good car and
want to use it in C class, you can. Do A class, then
start a new game (do not close the game and open it
again or you will just get the standard items). You
will get the same shape car you had previously, but
the performance will be different.