Good luck with the test, its gotta be worth doing. I did my IAM car test about ten years ago which was great but had its odd moments. My first two drives were with a woman librarian, ugly as sin, and I'm no oil painting. Then I got told I was too experienced (yeah, yeah) for her and had a police instructor after that. I drive 30000 miles a year, she did about 2000, but I never touched her, honest officer!
Then my test came round and a police driver got in the car, wiped the mirror, said this cars a f~*^@"g disgrace (he was right, it was a Renault 21) and told me to get on with it. Not a word was said for an hour and at the end, he just said, "you've passed, look in your mirror more" and that was that.
Anyway have fun doing it!