A complete examination cycle involves creating exam schedules, mapping subjects and maximum marks, collecting marks from every teacher, calculating percentages, applying grading rules, handling absentees and re-tests, publishing results and generating report cards in the required format.
When these steps live in separate files, the cycle becomes serial and fragile. The exam cell cannot begin consolidation until every teacher has submitted, one late submission holds up an entire class, and each handoff between spreadsheets is a fresh opportunity for a formula to be dragged one row too far.
The consolidation step is where most of the calendar time actually goes. Teachers usually finish marking reasonably quickly. What takes days is assembling those marks into a single sheet, checking totals, applying grade boundaries and formatting the output.