welp,All i can offer you are some good checkpoint times....as long as you reach the checkpoints under these...you should be able to finish her out. All i can suggest is keep racing your ghost over and over untill you get it or practice the course in a race somewhere. That's what i did.
here ya go... S-1 checkpoint times...if you don't hit these....start over.
1.0:19.00
2.0:35.00
3.1:09.00
4.1:43.50
please note, these times are only going to get you a bronze on the test...otherwise, you are gonna have to knock off about 1.5 seconds from each time if you want under in gold.