What are your priorities as a jungler?

So, I'm trying to learn jungle from scrap (plat-eme elo), but I feel like I need a crucial information: what is more important at what stage of the game? And which objective is more valuable?

If you don't mind, could you give me a tier list of what's more important for early, mid and lategame between kills, towers, waves, drake, grubs, baron, atakhan and farming camps? Something like:

Early - farm, kill, grubs, ...
Mid - towers, drake, ...
Late - baron, towers, ....

tyvm