Prime Minister Narendra Modi has expressed unhappiness about the leak of Class 10 and 12 CBSE papers, which is forcing students to take the exams again, sources told NDTV. Coming a month after the paper leak in SSC exams, the CBSE leak has placed the government in face of Congress allegations of mismanagement. PM Modi had dialed the HRD minister after the Central education board decided to reschedule the Class 10 Math and Class 12 Economics exams following reports of a leak of question papers, sources said.