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Assuming that your data looks like this -


$
$ cat f35
FirstName_MiddleName1_LastName_ID
FirstName_LastName_ID
FirstName_LastName_XY
FirstName_LastName_XYZ...

Try this loop instead that reads the values directly into the variables:
while IFS=, read InstrName VarB VarC VarD VarE VarF x
do
if [ "$VarC" = "$VarD" ]; then
Total=$((VarC + VarF))
...