It took me a while to get, but it seems i was wrong about not being able to get all the cars it depends on what your racing with. That will determine whether or not a car is offerd as a prize.
I got the SS liscence. It was HARD!! But it payed off, cuz now I got like 20+ cars (all that I purchased), and $1,000,000+. Skyline GTR-R-34 is the GREATEST CAR EVER!!!