ranking

[ScW Scream]

does the hard missions and normal missions both add up to your mission total?

[S4CK D4DDY]

Yes, they do. To earn the A ranking you must S and A rank a significant amount of the normal and hard missions. To earn the S ranking you must have all but a few S ranked, and of course the SS rank is for someone who's S ranked all the missions on both hard and normal.