A term-end examination produces one mark per subject per student. Continuous and comprehensive evaluation produces many — periodic tests, assignments, projects, oral assessment, practical work and co-scholastic observations, recorded across the year by different teachers.
That volume changes the nature of the administrative challenge. With a single exam, the risk is arithmetic. With continuous assessment, the risk is inconsistency: two teachers interpreting the same descriptor differently, or recording components on different scales.
Manual handling makes this worse, because each teacher maintains their own sheet in their own format. When those are combined at term end, the exam cell is not consolidating comparable data — it is reconciling several private conventions.