The Jungle role is irrelevant if you're not Plat or above.
The only thing this role provides for solo Que is getting your lanes ahead. In lower elo it doesn't actually matter how much you get you're lane ahead they won't win the teamfights for you mid/late game unless they're better players. Hell sometimes you will get top first and second blood in under 5 mins then they will proceed to get solo killed 5 times in the next 10 mins.