St. John's School retains traditional nomenclature for the ten levels of enrollment ("Forms"). The Form-grade equivalents are:

Primary School	Form I	Pre-Kindergarten
	Form II	Kindergarten
Lower School	Form III	First Grade
	Form IV	Second Grade
	Form V	Third Grade
	Form VI	Fourth Grade
Middle School	Form VII	Fifth Grade
	Form VIII	Sixth Grade
	Form IX	Seventh Grade
	Form X	Eighth Grade