mail merge with excel and word 2007

Hi

I am attempting to run a mail merge using an existing excel list.

I am needing to write successful letters to students communicating their results on scholarship. Some students may have 3 the other may have 6 which results in the student appearing that many times on the spreadsheet.

i have a claim document which th student must return to me for payment but, i am needing to merge all the scholarships to one student on this one claim.

please could anyone help me to fix this.
thank you