There are three methods to going through whoops with a couple general rules. They are stay in one gear, grip the bike with your kneew, and NEVER LET YOUR WEIGHT GO FORWARD!!!!!
Here are the three methods;
1)Skimming, This is the most common method and really takes no skill, just guts. You must lean back, grip the bike and pin it. If the front wheel goes too high, do not let off the throttle, just pull the clutch in a LITTLE. Do not drag the rear brake either. As long as your suspension is set up right and you are gripping the bike with your knees, you will go straight. When I can put videos on the net, I will post some of me going faster than Gary Semics through a set of whoops at his track. Very important to grip, lean back and skim the front wheel, do not wheelie through.
2)Doubling/tripling. This is self explanatory and only really works on huge whoops that have big spaces between them. YOu must have very precise timing and speed control.
3)Front wheel placement-This method is good for whoops that change size or a short set of whoops. You wheelie through a couple then lightly set the front wheel to continue with one of the other 2 methods of whoop riding. I never use this method as I can not set the front wheel down very lightly.
Once again, never let the front wheel drop or you will take a big soil sample.
Hope that helps!