As I understand it, progression for PSC/Education is 2 years in schools, 2 years in HQ, and then a decision on whether to return to schools (sectoral) or rotate to another ministry (WOG). The officer should enter HQ as a GEO3 and return to schools on enhanced posting as GEO4. Not sure whether it's possible to jump one sub-grade every year thereafter.

As for salary point, it's possible that this officer is drawing a higher salary than peers because PSC scholars are automatically emplaced on PSLP/FLP which has its own allowance. (Not the same as the RA that KPs draw.)