Shake it off
When it all goes wrong … Perhaps on a driving test. Perhaps after. Keep a cool head; concentrate on the present moment, the next few seconds. Forget what just happened, whatever you did, how other drivers behaved. Shake it off.
What comes next is always more important that what just took place. Especially if you're moving. Your ongoing performance matters more than occasional mistakes. So focus on keeping up your driving standard. You have a licence to be there, just as much as they do.
Only later on, once stopped, think how you could've made a difference. Or how all those strangers have gone now, never to be seen again. So what they thought or did doesn't matter any more.