I recommend trying to do this with the following settings:
- Race: Lv.1 – Adrenalin Peak
- Character: My avatar
- Board: Rare Board – High Top
- "A" Rank reference score: 11968 points
This one is also pretty simple. As you go downhill, just keep jumping and doing quick spins for 300 to 400 points. Then as soon as you land, jump and do another spin. You don’t even have to really worry about the other racers or even steering for that matter. You are just going for the most spins you can get before crossing the line. Repeat all the way down the hill and you should easily get the “A” rank.