i've done all the tracks,mirrored and reversed. but how do you do the stars column???

use cougar or another fast car. the loop is the hardest part, you do not have any advantages on using a fast car on this section, i recommend using phat slug or similar rookie car. in the middle of the loop is one too. try braking and fall from the top of the loop down on it. the next hardest is the halfpipe. drive with cougar or another fast car. just try to line up with the star on one side and then hit the throttle. if you do it right you should hit the star right on. the rest is just jumping on the jumps spread around the tracks.