Well, to be honest a lot of the scratching is out of time. Very rough sounding. The first two or three tracks that you mixed were not beat matched properly. That being said, the direction you are headed in is good. You just need to practice your techniques. I did not listen to the other sets yet. Yours is still playing. Well, you just dropped Daft Punk - Da Funk at 6:08 and sped it up, what sounds like an unecessary amount. It was also out of phase with the outgoing track.
Just clean it up a bit, you're headed in a good direction.
Wow actually the track before Barbara Streisand was also horridly terrible. Not to be a dick, but the rest of the tracks were good. Anyway keep practicing man, you definitely have a lot of promise. Also I would have transposed the key of Hello up, sounds like a key clash with the track you dropped over it (Happy star track from Rob Dyrdeks fantasy factory, whatever the name of the track is)
I will check out the other sets in a few, but overall, I would not have picked this set to be in a 3style contest. But seriously, you have potential, you are going to be on point soon if you keep practicing.