I had a maths test today. My revision comprised of text-book skimming this morning. I was gravely concerned that I was going to fail.

We were given 1 hour 15 minutes to complete the test, but I was done in 40 minutes. I was the first to hand the test up, followed by a friend 10 minutes later. Nobody else handed theirs up until right at the end.

The teacher marked mine almost immediately, as I was slightly smug about handing it up first, a fairly rare occurrence. She...