What is the composition of school education in India?

Grades 1 to 5 (corresponding age group 6+ to 10+ years), the Upper Primary level consisted of Grades 6 to 8 (age group 11+ to 13+ years), Secondary (Grades 9 & 10/14+ to 15+ years) and Higher Secondary level of Education consisted of Grades 11 & 12/16+ to 17+ years.