BHOPAL: Twelve students — including a brother and sister and a Bhopal boy who thought he deserved 90% marks — committed suicide within hours of the announcement of board results in Madhya Pradesh on Friday.Ten of the victims were in Class XII. Half of them were girls.In Satna district ’s Khamharia Paisihan village, 18-year-old Rashmi and her brother Deependra, 15, killed themselves within minutes of each other on realizing that both had failed the Class XII and Class X exams . Rashmi hanged herself around noon when their parents had gone to attend a wedding. Seeing her dead, Deependra hanged himself in another room, say police.In Bhopal, 18-year-old Naman Kadbe of Meera Nagar injected himself with poison because he had scored 74% and had expected 90%, said police. His mother is a nurse so he found an injection and killed himself. In Indore, 16-year-old Sumit Bairagi, a resident of Bramhbagh, hanged himself in his room after the results were announced. He had failed in two subjects.In Bhind, the only son of municipality chairman Kalawati Miholia hanged himself after failing the 12th standard. Tapish saw on the internet that he had failed in two subjects. Unable to bear the shock, he rushed to his room and hanged himself, police said.In Jabalpur, a girl who had failed in two subjects cycled to a railway crossing and waited for the gates to close. “Kanchan Dubey waited for a train to come and threw herself in front of it,” said Madan Mahal IC Y S Mishra.In Gwalior, Class XII student Pragya Singh Kushwaha hanged herself on finding she had failed in two subjects. And in Balaghat, 19-year-old Devendra took poison on learning that he had failed to clear two subjects.Three more girls committed suicide after failing Class XII —Rani in Satna’s Singhpur, Laxmi Kewat of Guna and Pinki Prajapati of Tikamgarh. And in Sidhi district, Pawan Kumar Panika hanged himself on getting his results.