The incident has evoked statewide protests by student organisations, matric examinees and their parents and the public at large even as SEBA said the affected students may be required to write the test again in only one subject within this month.
Results of the Board exams would be declared as per schedule for awarding of the High School Leaving Certificate (HSLC), it added.
The incident occurred in a school in the upper Assam town of Jorhat, SEBA said.
Sankardev Seminary School had received 459 packets of answer scripts for safe-keeping and 98 of those were destroyed in the fire, it said. Officials are trying to ascertain from which examination centres these answer scripts were collected.
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The affected answer scripts are of the subjects of English, General Mathematics, Assamese MIL, elective papers of Sanskrit, Additional Maths, Geography and Computer Science.
For those not willing to sit for a retest, the average of the marks obtained in the five other major subjects will be taken as the score in the affected script, it said.
Meanwhile, describing the incident as an act of sabotage, Jorhat district Deputy Commissioner Solanki Vishal Vasant said the fire was started by miscreants via a sky window near the table on which the scripts were kept.
He said the room in which the answer scripts were kept was a "safe one" and ruled out suggestions that a short circuit having caused the fire. A CID inquiry has been ordered into the incident, Vasant said.
Chief Minister Tarun Gogoi expressed concern over the
incident and asked Additional Chief Secretary, Home, TY Das to constitute a CID probe into the incident, a government release said.
Gogoi also directed Principal Secretary, Education, Paban Kumar Borthakur, to immediately submit a detailed report in the matter.
He directed the Deputy Commissioner, Jorhat, to visit the school to monitor the situation and asked the district administration to take stern action against anybody found responsible in the matter.