Here are some things you might want to study.
Read and know FAR 91.175.
Know your airspeed limits in Class A,B,C,D. Can you go faster if ATC requests?
Standard takeoff mins. Extra credit if you know how 121 carriers get away with taking off below std. mins.
How many hours, bottle to throttle?
Jepps, jepps, jepps!
Be able to explain why you want to work for Skywest.
Study the company, route structure, airplanes, how many of each. Grab the latest stock quote.
When was the last time you broke an FAR? That will be a question.
Have you ever failed a checkride?
Tell me about a time when you disagreed with a coworker/captain/flight student.
Good luck! Relax, but not too much. Look sharp, make sure your tie is straight, top button buttoned, sit up, be polite. Smile. It's okay to take your jacket off. Don't be afraid to say "I don't know." They will dig as deep as they can to see your knowledge level.