I don't get it.
This would work if leaks were from kids nicking papers when teachers weren't looking. A quick stock-check with an RFID wand would find the missing papers. I suspect however that the vast majority of leaks are direct from staff themselves armed with a photocopier. So how exactly would that stop leaks again?
Surely after all the years of schooling they'd have a large enough bank of questions to give each student a unique paper? That would at least reduce the impact of a leak.
As for "motivation," take a step back and have a look at todays GCSE's. It used to be the case that only the really clever 5% of students got a grade A. Nowadays, they're so pathetically easy, designed in this politically correct world to ensure that every white, black, brown, yellow, immigrant, stupid or clever person gets a pass they've lost their meaning entirely.