Solution

25019

First name
Nikilesh Ramesh
School
Wilsons school
Country
Age
13

The value of the missing total it 21. This is because the:
Triangle = 6
Square = 8
Circle = 4
Hexagon = 7
So if there were 2 circles, a hexagon and a triangle, this means that the equatino we have to do is 4+4+7+6=21!

So the answer is 21!