Start with something that talks about memories, of the beautiful school days or with something that wishes everyone a bright future ahead.

e.g. lines from the famous song ''hum rahen ya na rahe kal, yaad ayenge ye pal''. Take the main lines.

In the middle- You can a little about any favourite teacher (not personal, consider the whole class/majority). These are one liners between performances.

Other fillers- A. any highlight of your school life. or any memory you will never forget.

B. any quote (doesn't have to be a complex english quote; pick a hindi one or a simple english one but make it CLEARLY UNDERSTABLE for everyone.

C. If allowed, you can go down to the audiences and ask your principal/any teacher to say something about the passing batch.

P.S. I don't know If this would be of much help as I am late in replying. Was caught with some work.