Hi , It's a good school in my opinion. Mostly they maintain 1:15 teacher:student ratio here. sometimes it goes up to 1:18. but not more than 20.
They follow practical way of teaching. Waldorf method to be specific. As far as I know, uptil 2nd grade, students dont learn science through text books but via planting and gardening and they love it too.
PreKG - > 2yrs 6 months
JrKG (LKG) - > 3 yrs 6 months is the cutoff.