What is the class strength?

What is the class strength?

In an affiliated CBSE school, each section can have 40 students in each class.
Each class with 1 class teacher, 1 maid deputed on the floor and different subject teachers, with the ratio of 16:1 is being maintained.

GradesStrength
Nursery to Senior KG15 to 20
Grade 1 to 520 to 25
Grade 6 to 1025 to 35