What should be age of by daughter for class 7th

As per the Directorate of Education (DoE) guidelines for Delhi schools, there is no strict age criterion for higher classes like Class 7. However, The child should be 11 years old as of March 31st of the admission year. 

Age Range: 11 to 13 years is acceptable for Class 7 admissions, including re-appearing

Schools may allow a 30-day relaxation on the upper or lower age limit, depending on individual cases.
 

To explore schools, here is a list of the best schools in Delhi to find the one that matches your child's needs.