Children in those early years of formal lessons vary greatly when learning to read and write. The Individual Studies lesson plans for grades 1-3 offer only two possible schedules. (Space doesn’t allow us to have a schedule for the many variations.) Because every child is an individual, feel free to mix and match between the two tracks, and even skip what your child isn’t ready for yet.
One possibility for you would be to have your son use A Child’s Copybook Readers, vol. 1-3 for handwriting practice, New Friends and More New Friends for reading practice, and skip the Print to Cursive Proverbs. So, follow Track A for handwriting and Track B for reading. Print to Cursive Proverbs is also scheduled in Track A for grade 3, so it is okay for him to wait a year (or two, if needed) before learning cursive.