Warwick is a very efficent jungler because of his high sustain and lower mana costs along with his high single target CC and regen. This makes him an excelent aggresive jungler who messes with his oponents by taking there buffs and outsustaining them in general to force them behind and stay well ahead of the game. He is personally the most EFFICENT jungler in the sense that he almost never has to back he can pretty much stay jungling forever. To go along with this his ganking power after level 6 is one of the best in the game. Unfortunatly before level 6 his ganks arent very good but he makes up for that with his fast clear times and lower mana costs. I highly reccomend Warwick jungle to anyone struggling through a ranked league or just wanting to own it up in unranked matches.

One thing I see a lot in ranked especially lower leagues is people looking to challenger/Diamond and seeing who is succesfull there and assuming that if they play that champion they will drastically increase there chances of winning. This doesnt really work as pretty much everybody with a brain is going to know about what you are likely to do. (this goes down to the point of telling what items somebody will buy simply by knowing the chamnpion) So I will state this very plainly: This guide is intended to burst through low elo as quickly as possible with somebody that can adapt to almost any circumstance and is highly reliable AND unpredictable. This makes him pretty much the ultimate Bronze Jungler in the game.

Warwick is such an efficent jungler that pretty much any route I have used has worked just because he has such good clear times. The routes I mostly reccomend though are my personall early game farming route (no buffs can be done smiteless) Where you start at wolves and go to wraiths then finall golems and back to wolves again. Or my Counter-jungling route (Smite very helpfull here) where you start at the buff they are least likely to take first (most of the time they still need it) and invade with several allies. Then by making your way back to your jungle going through as you normally would but stopping to take ALL you buffs (this eliminates the chance they will invade and get the buff you stole) and farming regularly along with ganking and taking there buffs again and again to make them rage and fall behind. (along with messing them up and forcing them behind this can make them troll/feed and be toxic increasing your chances of victory by up to 30 percent) These are my 2 main routes but hey if you want to expirement with this or something go ahead because Warwick can usually do well pretty much regardless of what you do.

One thing that is suprisingly overlooked but very usefull is knowing when to get certain boots.
Berserkers Greaves work pretty well for all around sustain and clearing but sometimes its more usefull to get boots of switness or mobility (usually if you invading) or defensive boots like Mercury Treads or Ninja Tabi if your constantly contesting with the other jungler or ganking.

Since Warwick is so adaptable he can work with almost any items and runes/masteries as long as they synchronize with each other. Usually you want to get a combination of slight tankiness and higher attack speed. This lets pretty standard and outlying masteries/runes work. Combining these factors you can adapt warwick in champion select to almost any team comp or scenario as long as you can predict it and think of a way to counter it before the game starts.

Pros:
-Very Reliable
-Heavily adaptable
-can fit into almost any role
-good sustain
-low mana costs
-high regen
Cons:
-Close range
-Usually low burst
-Usually fits into 1 role not multiple

Warwick is a high sustain Jungler good for farming untill level 6 where he can easily lock down the other team during his ganks for an easy kill. I myself personally find him to be the most reliable jungler in the game due to how hard it is to set him behind.