As a former bus driver, you got this!
I’ve taken many practical tests, from cars to motorcycles to busses to airplanes and I still get nervous.
For me, when it comes to the rote memorization stuff, I find that it works out better wrapping up the study by noon the day before and taking it easy until the test, rather than staying up late studying.
And remember, after the pretrip, skills, and air brakes portions are done and you get on the road, you’re basically home free. In CA at least you get 15 mistakes.
Remember to memorize height signs for bridges and overpasses you come across, I nearly got dinged for that lol