If students want to cheat their way through one of China's most difficult exams, they'll now need to thwart a patrolling drone. The National Higher Education Entrance Exam, known as "gaokao," is held each year and determines whether youngsters will get into the top universities. It's been described as the "world's toughest exam" and can be stressful, even traumatic for students trying to achieve higher grades. Some entrants, ingeniously, try to cheat by capturing their test questions and sending them to someone on the outside, before receiving the answers via an earpiece. Unsurprisingly, China wants to crack down on the practise, so one province is now using a drone to monitor radio activity. When a disturbance is detected, it can alert the invigilators and help determine the culprit's location. The penalties for cheating are fierce, so authorities are hoping the threat alone will be enough to encourage would-be cheaters to spend their free time cramming instead.