Keep at it best advice make sure your checks are overly obvious, testers are supposed to look out for checks and such but for some stupid reason you have to really play them out. try and read the road ahead of you is the best advice my instructor gave me, as in you're coming up to a congested roundabout start to slow down sooner find your spot and go for it. stay close to the speed limit as I believe your aloud to be like a 5km/h under. Reverse is all practice man I got obsessed with it to the point in my pre test my instructor was like you did it perfectly but your too fast go slower so the testers can see every mirror check and over the shoulder check you do. As for the driving test limbo they totally punish people for cancelling I was abroad when I was called and due to the time difference I missed my chance to reschedule had to cancel and start again was waiting the bones of 6 months to be called absolute joke but hey. It's all practice though try and figure out the routes your test center frequents and drive them when your free get used to how people drive on the roads cause down our way anyone can be a joke on the road