Monster Tracks is a skill game where you have to fly your car through dangerous tracks.
That's why you have to be careful when you step on the gas pedal. If you step on it too hard, the truck could tip backwards and flip you over. Carefully look at the path and keep a small tilt backward, since most obstacles will push you forward. Change your speed to match the level, and you'll soon be able to handle this task. Watch out for things like spline bridges, rocks, tree logs, windmills, ramps, and a body of water that will end the game if you fall into it. You'll be able to use the shop to improve your car's speed, grip, and weight, making it easier for you to take on the next tasks.
Have fun and good luck!