Inspect the course prior to the race. Look at features in the terrain, such as fall aways and plan your turns. Have a mental image of where you want to go, and (try to ) stick to that line through the course. You also should be looking ahead to the next gate, not at the gate you are approaching.
If you are in a Ski league and riding, like I do, anticipate that the skiers will take a slightly different line, and if you are late in the order, you probably have to ride the rut, in their line. Also anticipate slower times. Last year I was not able to break out of the bottom 1/3 of the pack. And Finally. If there are not pull bars in place, Borrow someones ski poles, Use them for your push start, and then drop them behind you. Its not ideal, but it is better than nothing...
Go Fast!
-Noah