Oh lord, now i get it, that's by far the dumbest mechanic i've ever seen..i didn't understand because i never thought something as stupid could exist in a videogame. So in your previous match you did 7 revives and it showed 7/30, in your last match you did 1 revive and it reset to 1/30..omfg, wth are they doing.
"there is 31 players in a match" It's hard but not impossible a conquest match is 45 min, it's expert challenge dude, either you're an expert or you don't get the reward. Why are you so stressed about this, it's a game and everyone get's the same challenge.