Yes it is, even on the Vita version :). But I've learned the hard way that I can win expert races by getting the all-star powerup, usually somewhere in round 2, and sitting on it until round 3 :). Since I'm holding the powerup, I will get no other pick ups, and I will rely on boosting and trick boosts to maintain a 3rd-4th position. As soon as the final stretch comes, I hit the all-star and knock everyone out the way to win :).
Still does me no good on NON racing events like boosting challenges or rival fights, as the all-star isnt available there :). I win the 3 stars on these by replaying them 15 times :). --- Before you ask about the username, I'm a reformed Sega phanatic from the Sony-Sega wars! I accept Sony now, and I even own a PSP :D!
I hear ya it is pretty challenging, im at 118 myself. still trying to hit that 120 mark for a certain racer. I was at 95 and was almost ready to give up, but the more u play the better u get. Thats all ive got for u.