If it was me, I'd wake up at 6:30 and eat some oats with protein power and a splash of dextrose. Eat only the amount that will clear your stomach by 8:15 AM
About half an hour before the test started, I'd warm up and get the heart rate up to about 145 for about 5 minutes. Then I'd sip some watered down hammer gel (or any source of maltodextrin) waiting for the test. No more than 100-150 calories.
I'd warm up like that because I believe it lowers insulin secretion - I do not have any science to support this claim.
I'd sip the watered source of maltodextrin to avoid shunting blood to the stomach that aids digestion.
The maltodextrin source would be hammer gel because right now that's all I have.
As far as the night before goes, eat the usual to make sure you don't have problems falling asleep. I'm assuming the usual would be something that isn't high in fat or doesn't have a lot of high GI carbs and that you've consumed adequate carbs in the 72 hours leading up to it.
Be sure to taper off my training on the days leading up to the test to ensure complete recovery.
This is what I would do if I had to race at 9 AM. I'm assuming your test would be as grueling as the first 30 minutes of a mountain bike race.