Q-R-E/W Standard

Best evolution order for Durability patch. Also do this with bruiser build.
Q first for clear speed. R second for mid game fights. E last standard. W last can be good for providing utility in team fights if you can't really use jump.

Q-E-R Hyper Carry

Only good if you get fed. Best usage is with Draktharr build.

R/Q-W-E Utility

Q first for fast jungle clear or R first for better ganks. W second for providing utiliy for team. E last standard. If you haven't evolve R first you can evolve last instead of E depend on situation but not recommended.

1) KEEP FARMING

You have to level up in order to evolve your skills. So keep farming even at late game.

2) DO NOT DIE

If you die you can't farm. So try not to die unnecesarily.

3) PRESSURE THE MAP

You can best do it by not showing up in the map. So use sweeper and Control Wards.

NOTE: If you didn't get leash use smite at your first camp. Use potion when you need while clearing.

NOTE 2: Path towards where you will gank. If you don't see any gank opportunity after clearing your jungle just go base or reverse clear if you use fast gank route.

FULL CLEAR

Blue>Gromp>Wolves(smite)>Raptors>Red>Krugs(Smite)>Scuttle(If safe e.g. you see enemy jungler other side of the map)

Red>Krugs(smite)>Raptors>Wolves>Blue>Gromp>Scuttle(If safe)

FAST GANK

Red>Raptors>Gromp(smite)>Gank/Blue or Red>Blue/Wolves>Gromp(smite)>Gank/Blue

Blue>Gromp>Wolves(smite)>Red/Gank>Gank/Red