OK still not quite sure what you're trying to do, but in sheet 3 I made a row of the differences between predicted and actuals for "Accardo, Jeremy."
That should give you an idea how to use VLOOKUP to solve your problem.
The basic formula is:
The above formula would return the value in collumn B in a row contains "Accardo, Jeremy."
"Accardo, Jeremey" is the value you're matching, $A$2:$K$16 is the range of cells you're looking in, "2" is the number of collumns RIGHT of the first collumn in the range that you're matching (so if you start with col A, then 2 is col B, 3 is col C, and so forth).
For your purposes, add the name of the sheet in front of the range. Then you can perform mathematical operations among the differerent values VLOOKUP returns for idfferent sheets (in the attached example I only did subtraction)
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