Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
to jungle with amumu you kind of need smite but clarity isnt essential. you can change it out for something else if you prefer. i like it because despair is a mana hog. with this build i like to start at the two golem camp. this should give you level two quickly. move to the wraith camp then to the wolf camp and then steal the opposing teams wraith camp. you should be lvl 4 at this point pretty early in the game. im usually only a lvl behind the mid. if you have a pot left at this point you should be able to take the blue buff easily. my main goal with this build is to stay out of the way at early lvls when mumu is squishy, rush a sunfire (this allows me to farm creeps and monsters like crazy), and gank CONSTANTLY after six. if your doing exceptionally well and you have the extra cash swap out the second sunfire for a warmogs instead. and after all your slots are full you should swap the heart of gold for another sunfire. or just make randuins omen. your call