When Simon Kucera woke up, he found that he had changed from a teenager to a mathematics teacher at the University of London. Just when he was still immersed in the ecstasy of not having to take exams, Simon Kucera suddenly had an ominous premonition...

The dean slapped a math test paper on his desk and smiled kindly, "Have you forgotten? New teachers have to take exams with junior students in the first three years of their employment!"