Why would you not wear a suit? Show the respect to yourself at least wear a shirt and tie, you'll not be on your own but some choose not to. Id rather be overdressed than underdressed
Learn your fractions of time, practice speed distance and time questions and read your document thoroughly taking out any details and making notes.
plane at 400mph, how far will he be in 30 mins.
Speed = Distance / Time
therefor
400 = D / (1/2), D = 400 x 1/2 = 200miles
Substitute fractions of time where you can, it will keep your speed up. You dont have much time.