Hello hleelor,
Welcome to the forum!
Using your provided example file, I think a simple Sumifs formula will work for you. The example file is a .xls, but your MS-Off Version shows as 2010. If you have Excel 2003 or below, we can switch it to a Sumproduct version instead (Sumifs only works in Excel 2007 and higher).
So on your grade sheets, in this case Sheet '12', in cell F24 (the corresponding row for John Smith, ID 4005), use this formula:
Then copy over and down. You can use that same formula in all of your grade level sheets.
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