I still haven't finished the last license test in Gt3 (the one lap in monaco).... I didn't like the game as much as 2 because to win cars you had to run the equivalent of an endurance race (5-10 laps, 5 tracks) and it burned me out.
I am hoping they go back to the Gt2 rewards system, where a single race can net you a car (it's also an easy way to get $$$
)