OOSC: Sindh ~7.4m, KP 4.5m, Balochistan 3.5m.

What it does not prove: These counts rank provinces by the size of their child populations as much as by exclusion: Balochistan is smallest in absolute terms (3.5m) yet worst in rate (~69%), so the league table inverts depending on which measure you pick. All four figures cover only the 5-16 band, so pre-primary and post-16 exclusion sits outside them entirely.

Memory hook: 3.5m → Balochistan's smallest count, highest exclusion rate: size is not severity

Rebuts the claim: "Sindh's 7.4m makes it Pakistan's worst performer on schooling" — its 44% rate is well under Balochistan's ~69%; the 7.4m reflects population size.