The Board introduced the second shift in order to conduct examinations within the stipulated dates and to ensure sufficient preparatory leaves between certain papers. From double shift papers, to increased gap between important subjects, to reduction in exam calendar days, CBSE’s 2021 board exam datesheet (timetable) has it all. The double shift exams, only for Std XII, begins with the first slot at 10am and the other at 2.30pm.