dear student,

OPGL ranking is  the seat reserved for girls in open catagory.

GNGL is just like obop or gnop or obgl or others who reserve some seats.Gngl means u got some reserve seat in upsee.such as any college has 10 gNGL seats and u got 9th Gngl rank u can take admission and i wanna it clear that i m talking about 9th Gngl not gnop.

hope it helps!!