Classes 6 to 8 is the Middle School. Students now enter the portals of the Senior School. They are encouraged to be independent and work on their own. They use the facilities available in the library, -books and the internet- to do reference work for various class projects and for individual subjects. The emphasis on all round development continues. A schedule of after school activities is compulsory. Children sign up to play a Sport like hockey, basketball, etc. and join a Club activity like The Environmental Club, Aeromodelling etc. from Monday to Thursday.

Classes 9 to 12 make up Senior School. Academics become more structured. The syllabus followed is laid down by the Council. These years are the most crucial years of a students life in school. It is a time when decisions are made – decisions regarding which subjects to opt for in Group 3 for Classes 9 & 10 and what group to select in +2.

The three streams offered in +2 are Science, Commerce and Humanities. The core subjects in the three streams is as follows:

English and Environmental Educations, is common to all three streams. Besides the above subjects, students have to select an additional one subject from the Optional group which comprises of Biology, Computer Science, Mathematics, Economics, History and Art.

ART AS AN OPTIONAL SUBJECT
Sishya has an extensive Art Department as Art is offered as an Optional Subject to students of classes 9 to 12. The syllabus prescribed by the Council ensures that children are taught the use of various mediums like pencils, colour pencils, charcoal, pen and ink, dry and oil pastels for drawing. They also learn how to paint using water colours, acrylic, oil and poster paints. Students paint on various surfaces like glass, silk and wood, besides paper. Block printing, mono printing, tie and dye, batik, collage, stained glass painting, and glass blowing are a part of this syllabus.