The screening works by analysing data gleaned from the exam boards' online marking system.

BBC: New weapon in war against exam cheats

Just 32% of applicants pass the locksmith exam, state data show.

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The watchdog appears to question whether it is possible to have an exam which can provide reliable data for league tables and which at the same time is capable of being taken and passed by teenagers of all abilities.

BBC: Gove challenged over exam changes by watchdog Ofqual