The number of students penalized for cheating in school exams and coursework in England rose by over a quarter last summer, the country’s exam watchdog said on Monday. Candidates caught with mobile phones in exam halls accounted for around 25 percent of the offenses, the Qualifications and Curriculum Authority said. “Over recent years we have seen a noticeable rise in the number of mobile phone related incidents in examination halls across the country,” said QCA Chief Executive Ken Boston.