Most has already been stated.
If you want to improve things, i would try setting up some corner markers (2 liter soda bottles, or milk jugs filled w/ water.) and practice taking them at different speeds which could represent the type of corners you might encounter on the track. 90 degree vs sweepers. Even setting up a slalom course can be helpful in chicane type conditions.
If you have a park nearby w/ a baseball diamond, thats probably better than a paved parkinglot.
You movements should be smooth and fluid. Try and take a corner in a rounded method rather than squared off or jerking motion. You'll develop a tighter faster line and can shave time off your laps.
Best to practice ON TRACK though since that will be the actual conditions you will face.
RACE CARS: B44.1, RC8.2E FT, SC10.2 4X4, B5M, YZ-2
RADIO: Futaba 4PKS/3PKS. BATTERY: Venom
ESC: SpeedPassion. MOTORS: SpeedPassion / Venom
"Im not a racer, but I play one on the Internet"