Catechesis of the Good Shepherd - Level 3, Grades 4,5,6 / Pb250001 This Montessori-based program is based on the belief that children have an innate knowledge of God. Trained volunteer catechists assist the children with their discoveries of God in Level I for ages three to five, Level II for grades 1-3 and Level III for grades 4-6. To lean more, click here.