How to get S with jarvan??

newshadown - Summoner Stats - League of Legends
newshadown / Gold 3 41LP / 28W 27L Win Ratio 51% / Braum - 8W 5L Win Ratio 62%, Nautilus - 6W 3L Win Ratio 67%, Xin Zhao - 5W 0L Win Ratio 100%, Sion - 3W 2L Win Ratio 60%, Sona - 3W 1L Win Ratio 75%
11/1/24 and again I got only A, all my teammates got A+, S-. Like every game I'm getting only A with him, it's impossible to get S-, what I need to improve to get S- or S ?
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