I just bought my 12-year old grandson a new bow -- Golden Eagle Sparrowhawk II, 40# draw weight, 27" draw length, NAP Quik Tune rest, Vital Bow Gear 3-pin sight, and he shoots with a release. The bow fits him well, but he's having trouble getting sighted in at 10, 15, and 20 yards. His shots are all over the place. I've told him to hold the bow level, focus on the spot, good stance, etc. but he's getting a little discouraged. Any suggestions?