You can probably clear the building in jump 36, but it doesn't seem to matter if you don't. The rest are pretty simple, with the only difficulty being controlling your bike over the bumps.
Remember, you can change your bike's position in the air with the left stick. Holding up will dip the front down, while pulling backwards will bring the front up from a nosedive. You can also turn the bike left and right, but remember that it will take a while to perform these actions in the slow-motion of the jump, so choose quickly what you want to do, then stick to it.