At 13U, he'll want to play on the best team possible where he's receiving a satisfactory number of reps.
He'll jump to 14U this Fall, and tryouts for those teams will take place in the June/July timeframe. It's at this point where he'll want to consider a very good to excellent organization, again where he'll play a satisfactory number of reps.
At the 15U level, that's when you'll want to consider an elite organization, but only if he's forecasted to play. This is very important, as you can't get to the 16U level without succeeding at the 15U level! Ditto 16U to 17U.