Berserker's Greaves -> Ravenous Hydra -> Duskblade/Prowler's Claw

You often want to start with a level 3 gank into top or capture 1 or both scuddels. After full clearing once, you should either have a kill or 1 scuddle.

-> With 1 scuddle, or assist-kill-gank you should go back to krugs/gromp(depending which side you started) and clear it followed with a back to get the Berserker's Greaves

-> With a kill-gank, you should back after full clear and 1 scuddle.

Farm and play the game out, try to get level 6 with as little back as possible. around level 6, with a good cs, you should be able to buy most components of the Ravenous Hydra, this item is the ultimate powerup of sett in the early game, allowing faster jungle clear, ability haste, attack speed and the perfect amount of omviamp to win sett in the fight in almost all 1v1.

Now going into end game, the other team's damage will start to ramp up, sometimes killing you before you can get a double kill or even clean up. This is the time to get the item Duskblade, duskblade allows you to go kill mutiple people as long as you kill one, the invisablity makes it so you are sure to avoid cc and point of click abilities. The lethality also helps with killing tanks who might build armour.

Durning the end game, you would want to analyse the game and see if the opponents have a lot of sustain/cc or tanks or more squishies.