The number of students penalized for cheating in school exams and coursework in England rose by over 25% in the summer of 2005. Candidates caught with mobile phones in exam halls accounted for around 25% of the offences, the Qualifications and Curriculum Authority (QCA) said. 4,500 students were penalized during last summer’s round of A-level and GCSE exams, a rise of 27% over 2004.