St.Johns took root way back in 1969. At that time, a great need was felt by the people of Gannavaram for an English Medium School that could provide sound education to children. Late Dr.C.L.Rayudu, an eminent personality of Gannavaram took the initiative and approached the then pro Nuncio (Vatican Ambassador to India) when on a visit to Vijayawada to persuade him to request a catholic Religious group to start an English Medium School at Gannavaram. His efforts bore fruits when the Bishop of Vijayawada Diocese at the request of Pro Nuncio invited the Montfort Brothers of St. Gabriel to set up an educational institution at Gannavaram. A team of Brothers, Bro. Felix, Bro. Julian and the late Bros. Vincent and Stansilaus arrived to pave the way.
Two acres of land for starting the school was provided by late Mrs.Venkataratnamma. Another twenty acres of land around was bought by the Brothers. The foundation stone was laid by the then Chief Minister, K.Brahmananda Reddy on 31st August 1969.
With generous assistance given by the late Dr.C.L.Rayudu, thatched sheds were constructed and under the dynamic leadership of Bro.Julian as Principal, St.Johns was officially inaugurated on 10th July 1969. Since it's inception, St.Johns took giant steps across the educational arena.
One of the aims of starting this institution was to cater to the educational needs of rural agricultural people of costal district of Andhra Pradesh. The need for hostel became imperative and so St. Johns Home was also established in 1969. The girls wing of the hostel was established in 1983 and is managed by the Sisters of St. Peter Claver.
The school began by preparing students for the Andhra Matriculation Examination. The first batch of students took the examination in March 1972 and came out in flying colours with cent percent results. As the standard grew, St. Johns sought affiliation to the Central Board of Secondary Education and Provisional Affiliation was granted in May 1974. In March 1975, the students appeared for the All India Higher Secondary Examination for the first time. Thereafter, Provisional Affiliation was extended upto April 1978. The school was granted permanent affiliation in May 1978 and since then the students have been appearing for the All India Secondary School Examination.
Time flew and the demand for more admissions made it a necessity to press for more accommodation and more spacious buildings. The then Chief Minister, Mr. M. Vengala Rao, laid the corner stone for the first phase on 4th September 1974 and also inaugurated the buildings on 1st April 1976. A beautiful and spacious hostel building came up simultaneously and was inaugurated by the then Education Minister, Mr. M.V.Krishna Rao, also on 1st April 1976.
St. Johns kept abreast with time as it introduced the best facilities available in the form of a magnificent library, well equipped modern laboratories, the best in sphere of Sports and Games, a Childrens Park, a Zoo etc. People began to sit up and marvel at all that was taking place. There was a constant flow of humanity to the portals of St. Johns seeking admission and soon the second phase of buildings took shape.
Under the able stewardship of Bro. Julian, Bro. James, Bro. Claude, Bro. M.M. Joseph, Bro. Thomas Aquinas, Bro. Baltha Raju, Bro. K.M. Joseph, Bro. N.C. Mathew. Bro. Jaico Garvasis , Bro. Lawrance DSouza ably assisted by a community of Brothers and a group of dedicated staff, the school developed in leaps and bounds. The fame and success of this institution enjoys today is the result of tireless efforts of the pioneering Brothers, the staff and co-workers over the past 35 years. This institution is beholden to all of them. Presently Bro. Shine Alex is heading the institution.