HSC examinees in a centre in Chattogram sat for the exam at 12 pm on Thursday instead of 10 am due to distribution of wrong question paper.
Students got Physics 2nd paper questions instead of 1st paper at Sitakundera Bhatiari Vijay Memorial College this morning.
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Guardians said that the wrong question papers were distributed at the beginning of the exam. After that, the question papers were collected from the students and the examination was postponed for about two hours.
A three-member probe committee headed by Assistant Commissioner (Land) Md Alauddin was formed to look into the matter.
Mustafa Alam Sarkar, upazila secondary education officer, said the concerned centre secretary is responsible for collecting the question papers the night before the examination.
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The question papers are handed over to every centre secretary or their representative from the treasury of the Deputy Commissioner's office.
Rafiqul Islam, Upazila Nirbahi Officer (UNO) of Sitakunda, said an investigation committee is being formed from Chittagong Deputy Commissioner's office to look into the matter.