Om- is the denotion of eternal height and Tat Sat - states that the true achievement lies in it.
"Om Tat Sat" is the worldly representation of our final conclusion - God. It is the summary of our three Vedas and the base of Bhagvad Gita.
Any effort made with the aim of achieving "Om Tat Sat " which is the only truth and purity associated with a master, yields pure results with no traits of falsehood or selfishness in it.
With these ideas, the Motto of the school was decided "Om Tat Sat" which here symbolizes the pure and true effort by the Jack and Jill family for gaining knowledge in every field and finally achieving the eternal truth "God".