Can you attach Workbook?
something like this?
Let's assume your data looks like:
Month Grade Average Test Tutor Name Homework Score June A 87 David 14 July B 90 John 12 August A 91 John 12
Step 1: Pivoting data in Tableau data source:
Step 2: using Pivoting values in report:
You can create calculated field on Pivot Values to append % next to number where pivot field name ="Average Test"
Hope that helps.