IO540, I've never seen one of the confuser books, so run the risk of opining out of ignorance!
I worry that working at examples might teach examination passing, rather than understanding. However, that's a generalised fear, rather than specific, obviously. You evidently feel that it is not a reasonable position to take, and I bow to that.
Interesting comments about the FAA/JAA eyesight requirements, I must study this in more depth - thanks, TPK, for the thread, and IO540 for the info..