Here is an idea.
I would pivot the subject measures. Go to Edit Data Source and select the subjects, right click on the header and select pivot.
This will create two new fields called pivot field values and pivot field names. I renamed these score and subject, respectively.
Now create a field to rank the score, we are now looking at a single measure thanks to the pivot.
You can use this rank to find your value. In the attached workbook, I created a parameter to emphasize score ranks anywhere from 1-4. So with the parameter set to 2, you can see the 2nd highest score is orange.
9.2 workbook attached.
Pivot Emphasis.twbx 22.7 KB