Guild Wars 2

Hi.

1, I am not sure if i should level my necro above 20 for now (i plan on leveling a lot with crafting, as soon as i have the mats….), but the problem is, that i am getting these boxes with pvp, and not sure what they are supposed to drop….
-I mean the loot from them seems to scale(?) with level?
-Can i repeat each “line” of progress for boxes and get rewards again if i keep playing more and more spvp? Or they are 1 time fill up progress?
-Would i miss good chance on lv 80 exotics and kitten if i complete them before 80?

Most PvP tracks are repeatable, there is an icon in the left of the track showing if it is repeatable or not.

I’m not sure if it scales with the player level, I think it does.