Detention for student in First Grade based on Attendance or Performance

[azharparkar]

I am Indian expatriate.

My son studies in Fist standard of a CBSE affiliated school.

Unfortunately i had to take a leave (40 days) in december with my family.

I had given an application for the school.It was kept in principals office and the blame of not checking the status is placed on me.

I had to take my family with me as i cannot keep them with anyone in an alien country.

Now the principal of the school is telling me that my child who studies in First Standard can be detained in same standard for lack of attendance.

He is a regular student to the school.

I want to know can a First Standard student be made to repeat class.