There were teething troubles on the first day of the HSC exams in the city, as faulty barcode stickers on answer sheets kept examination centres on their toes.The codes are the only way the identity of a student can be established by the education board after the exams. However, the board said that such cases have been rare, and it has already provided emergency barcode sheets to all exam centres in the state.

Backup: Emergency HSC barcode sheet. Representation Pic