Filtering data in a Table Visual

If you use hierarchy and a matrix you could make this happen. 

So using a matrix visualization, put Subject in the columns, and then put Nationality AND Division in the rows. Put the grade in the values and calculate average.

Refer to this on how to then use the drill down within the heirarchy: https://docs.microsoft.com/en-us/power-bi/consumer/end-user-drill

If you also want the original table, you could acheive this using a merged calculated column containing the name, division and nationality and put that on the top of the list in the Rows pane.

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I work as a trainer and consultant for Microsoft 365, specialising in Power BI and Power Query. 

https://sites.google.com/site/allisonkennedycv