Getting a S- or S in jungle

Oy, I would like to know the main criteria for getting a S in jungle. I have 20 lv. 7 champions but i always struggle with junglers so maybe i don't understand what i need to do. So i had this match: 21 minutes: 3 drakes, 2 heralds (both used to take 3/6 towers with my team), good vision score and average farm (142 for 21 minutes) and also 4/0/7 with a tripple (46% KP) Result: A+ So i'm guessing objective control and warding doesn't matter in getting S tokens, just as many kills as possible and big farm. (?even as jungler) Can you guys illuminate me with what i must change in order to get S?
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