Admission Eligibility & procedure in St. Xavier's Collegiate School Kolkata

Which is the St. Xavier's Collegiate School Kolkata Admission Eligibility & procedure, will you please provide here?

St. Xavier's Collegiate School is situated in Kolkata, West Bengal and it came into existence in 1860 by the Jesuits.

It is affiliated to the Council for the Indian School Certificate Examinations.

Admission Procedure:

Age Requirement:
The child's date of birth must fall in the year 2005.

Application Forms for admission to class One will be issued from the Primary Section, 12A Wood Street (entrance from Hungerford Street), in October 2014, against a fee of Rs. 200/- and two recent colour passport size photographs of the candidate.
Each photograph is to have written, on the reverse:

Boy's name in full
Date of birth
Father's name

Contact:
St. Xavier's Collegiate School, Kolkata
30 Mother Teresa Sarani
Kolkata 700 016
Ph: +91-33-2255 1171

Map:

Sir,
I want to put admission in repute school,but I am quite confused about eligibility criteria as far as age concerned,he is 13/05/2013 born so whwn will he be eligible for schools like st.Xavier,Calcutta boy,la matrinere boy,st.Stephen
Thanks