How to get an S by being a jg?

I am a jg main and I have lvl 4 kayn and I realy want lvl 5 but I need 2 S's but I do not know how to get them but just getting lots of kills. I also know u need lots of cs. If someone knows how to get it and the expatations to get an S (for example 10mins in 5 kills and 100cs from a jg) tell me please. Thanks
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