Y ddau Jac1999
(The Two Jacks)
by Tony Bradman
Jack Baker is the perfect pupil. He does his homework and never, ever does anything wrong. Jack Barker is the bad boy. He gets in trouble and never, ever does anything right. Everyone knows what the two Jacks are like. Until a new teacher gets them mixed up - and everything changes.
— from OpenLibrary
5 editions at OpenLibrary