Election was postponed at the assembly seat after Left Front candidate Ramendra Narayan Debbarma expired of cardiac problems on February 11 last.
In rest 59 constituencies of the state voting took place on February 18 last.
TBSE president Mihir Kanti Deb said the date of exams of Mathematics and Philosophy were scheduled to be held on March 12, but that day the postponed election for the Charilam constituency would be held, so the exam would be taken some other day.
Twenty seven thousand students would be writing their Higher Secondary exams this year.
Deputy Chief Electoral Officer Debashish Modak said the result of the election for the Charilam constituency would be announced on March 15.