But other classes or tutorials are only 1 or 2 times per week. The kid can't learn any PTH on the days without lessons. The ideal learning is: using Kumon material but with native PTH teacher speaking with the kid every day, 7 days a week. If it's too expensive, then Kumon material + CD is a good choice.
If the PTH teacher's fee is very low say $100/hour, 0.5 hour/day x 30 days = $1500/month. But can the teacher come for 0.5 hour every day to earn just $50?