India, Feb. 25 -- The Central Board of Secondary Education (CBSE) will introduce two-tier difficulty levels-standard and advanced-for science and social science for class 9 from the 2026-27 academic year and class 10 in 2027-28.

"From 2026, students of class 9 will be studying two levels - standard and advanced for science and social science. These students will study both levels in the same subject in class 10 and sit for board exams in 2028," CBSE chairman Rahul Singh said on Tuesday.

The decision was taken after CBSE's governing body approved the proposal of its curriculum committee to offer the two levels.

Singh said science and social science may have either a single question paper with an extra set of questions for the advanced l...