Basically what two smoke said. Body position is the biggest thing you can do for track on the hardpack corners. Don't lean with the bike, put your bum on the edge of the seat that is OPPOSITE to the way you're turning and keep your body upright through the turn. Push down hard on the outside foot peg. That helps alot.
Other than that, just the obvious. New tires if your current ones are shagged, easy on the throttle don't apply very much power until you're pointed in the direction you want to go, clutching etc.
Good luck
