Question: what is the difference between grade r and grade 0?
Answer: Grade 0 or Grade R? There is no standardised name for the year before grade 1. I've used the term grade R to refer to this class for children aged 5 turning 6, but some schools call this grade 0 (and grade 00 the year before) – while others refer to grade 0 as the year children are four turning 5.