I know that S ranks are tied to KDA. I really wish other things mattered more such as objective taking etc, because I'm turning into an a**hole.
Until i get rank 7. I'm buying GA as soon as i finish my Gold Income Item, and my Ward.
I'm Black Shielding myself (as a Morgana main) instead of my team mate
If Caitlin targets my ADC with her ult, i let her take it
And if my ADC heals me to keep me alive, i let her die.
And i get the S rank.