What to do if I fail my test?

My test is coming up in the next few days and I’m very anxious.

I know I can pass (as in I can drive perfectly) I just don’t know if I will be able to due to nerves. If I fail what should I do? Should I carry on with my lessons and/or should I get a new test booked as soon as possible, even if it is an area I’m not familiar with?

Sorry if it seems like a dumb question I’m just quite anxious and paranoid.