In order for your legs and buttocks to fire correctly during the swing you must increase the circulation in your feet so that they do not inhibit these important muscles
Is it important for a junior to have a pre-shot routine to hit good shots, so teach him one like this
Narrow down your focus on short putts by putting to a tee and trying to hit it dead on, this makes your short putts much more exact and gives you tremendous confidence when you are on the course putting to what looks like an enormous hole