Create single spreadsheet file with three sheets as shown in the screen-shots.

Note that:

a. For sheets VII and VIII:
   1. Changing any value between C9-C13 changes total stored at C16 automatically.
   2. Changing any value between D9-D13 changes total stored at D16 automatically.
   3. If either C16 or D16 changes then percentage at C17 changes automatically. 

b. For sheet Graph:
   1. Changing class at B3 in sheet VII or VIII changes legend in Graph automatically
   2. Changing subject names at B9:B13 in both sheets changes subject name in graph automatically.
   3. Changing marks at C9:C13 for any subject in sheets VII or VIII changes graph automatically.
