Pass percentages and subject-wise performance by class, section and student — the figures the staff room argues over after every exam, prepared before the meeting rather than during it.
Where a class is losing marks
Subject-wise performance across a class shows whether a poor result is general or concentrated in one paper. That is a different conversation with the teacher, and a different remedial plan.
Section against section
Comparing 9-A with 9-B on the same paper is the comparison a head of section actually wants, and the one hardest to assemble by hand from two sets of mark sheets.