Watch: China deploys drones to catch pupils cheating in exams

Chinese students sat the annual make-or-break university entrance exams on Monday with officials deploying drones and high-tech radio surveillance trucks at schools across the country in a bid to try and curb increasingly sophisticated cheating methods. Nearly 10 million students take the crucially important two-day exam, known as the gaokao, or "high test". Authorities have become increasingly concerned about the risk of students using devices such as smartphones, which have become smaller and easier to hide, as an illicit aid during tests.