In the year 1978, Higher Secondary classes with Science and Maths subjects were introduced in the school, with a view to enable students to pursue medical and engineering courses at higher levels. Also , a separate block was constructed for Higher Secondary classes. Additional buildings were put up for the primary classes too. In the year 1981- 82 Nursery classes were started, thus relieving the parents of their anxiety to seek admissions for their children elsewhere. This necessitated the closure of the hostel as the place was required to accommodate the Nursery Section.

In 1986, Rev.Fr.A.Maria Mudiappan was transferred to St.Michael's Hr.Sec.school and Rev.Fr. Joseph G. Felix was made the Principal. The rich experience that Fr.Felix had acquired during his six years as Vice- Principal in the same school, was an added asset to his admirable qualities of mind and heart. Sensitive to the needs of the time and particularly to the needs of the students, he evinced a keen interest in the progress of the school in a fast developing and challenging society. Realizing the need for computer education, a computer Centre was opened in 1986. Believing that, ' All work and no play, makes Jack a dull boy ', two basketball courts were laid in the modern style, along with a hockey court, to encourage student participation in athletics. The Herculean task of filling the pits and leveling the uneven paths was undertaken side by side with the construction of the orname ntal compound wall with botanical setting. The big and dry well was filled up and a new bore well was dug. The Silver Jubilee of the school was celebrated in the year 1989-90.To commemorate the Silver Jubilee in a fitting manner the bed room of the former hostel was converted into a Silver Jubilee Hall with a beautiful stage and false roofing.

In June 1990 Fr.I.Maria Antony Raj took over the administration of the school from Fr. Joseph Felix. The Silver Jubilee Hall was completed. The Patron of Carmel Garden Matriculation School, Rt. Rev .Dr. M. Ambrose, decided to start an Arts and Science College. Since the building for the proposed College was not ready,the college was started in the Carmel Garden School campus. A modern Toilet and a spacious Canteen were constructed.

Rev.Fr.A.L.Sundar Raj was appointed the Principal and correspondent on June 2, 2003 by the present patron Most Rev.Dr.L.Thomas Aquinas M.A., D.C.L. There were 1955 students and 95 staff members. A modern , spacious office for the Principal, a new school office equipped with computers, an open air stage at the corner of the football field and spacious verandahs in front of the Primary Classes were some of the additions during 2003-2004. As the strength in the primary sections was denying personal attention to the children, it was decided to have four sections from Std1 to Std.5. It was also felt that having a separate block for the Primary would be of a great help in imparting knowledge and in inculcating discipline. Hence there was a need to construct 12 more additional class rooms. These class rooms were built during the summer of 2004 and the students occupied the new classes on 02.0 6.04.The Main Building , The Higher Secondary Block and the Primary Section were connected by means of two bridges . These bridges have enabled the teachers to have easy access to all the class rooms. The Uniform of the students was changed in June 2004. Fourth section was added to standards 1 to 5 in June 2004. It was planned to have a web site for the school. The school web site was launched on Sept.3, 2004.