Can a riven main ( or high elo person ) help and give some advice.?

My brothers a riven main and he's lvl 26. He's getting extremely irritated when i play with him because the people he fights always win lane. I've been jungling trying to camp his lane and play mid to roam sometimes but even I see it. I dont think he's fought one person who wasent a smurf yet every game its the same, like a plat yas a plat darius gold 1 whatever. He's still lvl 26 and learning the game. Can someone thats a riven main maybe come on teamspeak and give some advice or something i'd greatly appreciate it. I'm silver 4 so i cant really help that much
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