How the hell do you get an S on nunu jungle

I dropped 1000 wards dewarded the everything stole all the enemy buffs had a score of 9/1/25 decent jungler farm and did about as much damage as a nunu possibly can stole dragon even stopped 3 barons like there was no way to have a better game other than my 1 death and this is an A+ like seriously man how do you get a chest on this guy.
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