Grade pay of Computer Operater fixed at Grade pay 2800

I am working as a Computer Operator / System Incharge in a reputed private school and have joined in the the pay scale of 4500-8000 before 6th pay. But after revision of 6th pay i was offered with the grade pay of Rs.2800 and my starting basic pay is Rs.9300 along with two increment. My gross salary is Rs.23000/-. Teachers have joined along with me are getting higher pay. I would like to know whether i can claim for higher grade pay or not. Please help.

T.Thapa