The Comms module in ScholarPack does not accommodate Mail Merge, but you can generate an excel file then follow this guidance to perform the action in Microsoft Word.
If you go to Reporting > Reports > Student (tab) then All Contacts by Student Report.
You can filter the Year Group and Contact Order columns by entering the required number, then pressing return (e.g. Year 6 and Contact 1 in the example below). This will display all the contacts 1 for that year group, with their email address and other contact details
To remove any columns you don't require, click on the dustbin icon at the top of the column. Then to download this as an excel file click on the yellow arrow in the top right of the screen.