First Registrant Academic
Transitional kindergarten (abbreviated TK) is a California school grade that serves as a bridge between preschool and kindergarten, to provide students with time to develop fundamental skills needed for success in school in a setting that is appropriate to the student's age and development. It is not called preschool because it generally comes after preschool and before kindergarten.
Transitional kindergarten is also available in some schools in other states and can serve as a stepping-stone between preschool and kindergarten, especially for children with birthdates close to their state's kindergarten cutoff date.