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.
Amumu is tank and can come in very useful in team fights and for an occasional stun when needed. He is one of the best tanks to use, especially in team fights because of his ultimate (which stuns all enemy champions within its range). This guide tells you how to jungle until level 6. This will help you understand how to jungle Amumu and how to do better in the beginning of the match.
The Runes chosen will help you to be more tanky and it will be easier to jungle in the beginning. The Runes will improve all areas for a tank like Amumu such as: Armour, Magic Resist, and Health.
Amumu Jungle Tips
In the start you're going to jungle, start off at the ghouls and then move to the wolves. Use smite occasionally, fight the golems and then recall. After you recall you should be around level 3, go to the big golem and kill it, after your level four or level or five then get red buff, and repeat the process til level six then you can lane and jungle occasionally.