Lol, i have played a total of sixteen ranked games, and last season when i finished my placements i got s4(not a ranked team score, soloQ). I'm not crazy about ranked, only reason im going to try to hit gold this season is for the kalista victorious skin.
Not being an ass, it's a joke. I would say the same thing to my friends.
What he needs to do is look at the things he is bad at, like the worst, and improve on those. it's easier to improve on the things you are terrible on than stuff you are decent at.
There is the advice.
And play carry champs and target ban the counters
So don't be mad, mate, be glad!