The trap-for-heffalumps

[rekraft.livejournal.com]

Answer any three questions in Section B. Answer any three questions in Section C. Then answer as many questions as possible from all three sections, bearing in mind that questions in Section A carry fewer marks than questions in either of the other two sections.

In the words of Janice Scott, no less, Lawrie's Prosser was a "useful gimmick". How believable is the trap-for-heffalumps in the context of a school like Kingscote - or does it come across as a bit of a deus ex machina?