The largest school in terms of pupils is the City Montessori School in Lucknow, India, which had a record enrolment of 39,437 pupils on 9 August 2010 for the 2010-2011 academic year.
The school was founded by Mr. Jagdish Gandhi and his wife Mrs Bharti Gandhi. The pair launched their first campus on a borrowed capital of 300 rupees, housed it in rented premises and began with only five students. The school admits boys and girls between ages 2 and 5, who can then follow through their education to Degree Level. The school was the recipient of the 2002 UNESCO Prize for Peace Education.
above from the Guniness world records.