Well most people like clowns do all the high stuff first(nightfall,dreaming city, gambit prime,and,raids)and then do low stuff (crucible,vanguard playlist, and gambit) last. Doing the low activities last will screw you out of gear and playing only one class(almost everyone that has this problem) is limiting how fast you go up. You don't get powerful gear for making 3 of the same class anymore you have to use 1 of every class and make sure to do your favorite or main class last. This is efficient level progression with the unnecessary limitations we have.You are guranteed 670 first week,680 second week or higher,690 third, and max fourth.