Bleed your brakes and make sure you have good pads. Nothing worse then running out of pad material at that track.
Check all of your fluids. Make sure your brake fluid is topped off. If not, it will throw some crazy dash warning lights.
Your power steering only needs to be to the add line. It doesn't need to be to the full line. The reason is because the fluid will get hot and expanse. It has to go someplace. If the reservoir is full. It will leak out of the cap. Leaving a mess.
Check your air pressure in your tires.
Listen to your instructor.
Be smooth with your inputs. Smooth on the brakes, smooth off the brakes. Smooth in moving the steering wheel. Keep both hands on the wheel, unless you are shifting.
And read this.
Track Day Best Practices - MUST READ