If they have cdj 2000's at the comp, then Just look at the bpm of the song, but dont look at the screen when launching or nudging it into sync. Download rekordbox and analize all your tracks. If they have anything else, eg cdj 800's then choose your track wisely. The dude I versed a while go had only 128 bpm tracks, he even turned off the pitch fader! And practice mixing without looking at the laptop.