Can someone please tell me why I didn't get an S?

30 min 99 farm, i had a game where i went 14/8/8 which isnt that good but i had 330 farm at like 30 minutes so it gave me S

i have nvr seen such terrible farm scores a@ 30 min, your should have 180 minimum. 150 if ur jg

CS and judging from your jungle item and trinket, you never destroyed any enemy wards.

Also how many dragons/baron did you guys get?

Because your stats are worse than "far better than the majority of games of people playing that champion" and the grade may be pulled down by deficiencies in important areas and areas the champion performs well in.

What kind of MMR is this?

Graves built 2 boots. Tristana essentially only built AS. Kindred was going for a full set of LS or something. Ryze bought some crit.