The Indian school system is a multi-tiered structure comprising pre-primary, primary, secondary, and higher secondary levelsIt's characterized by a mix of public and private schools, with a focus on primary education (ages 6-14) being compulsory. The system also includes various boards like CBSE, ICSE, and state boards, as well as international curricula like IB and Cambridge. 

"Montessori 1" generally refers to the first level of the Montessori education system, which is the nursery or preschool level, typically for children aged approximately 2.5 to 3.5 yearsThis program focuses on developing foundational skills through hands-on activities like practical life exercises, sensorial activities, and introductory language and math concepts. The goal is to foster independence, refine motor skills, and build a strong foundation for future learning. 

Pre-KG (Pre-Kindergarten) is an early childhood education program for children typically between ages 2.5 and 4, designed to be a bridge between informal home learning and formal kindergarten. It focuses on a child's overall development through play-based learning, emphasizing the development of social, emotional, cognitive, and motor skills. Pre-KG helps children adjust to a structured school environment, learn basic literacy and numeracy, and gain skills like following instructions and socializing.

7 Good Reasons Your Child Should Attend Preschool - EducationWorld