Well thinking back to my primary mathematics days mode is the most frequently occurring score ( at least I hope it is ) ...
Now there are a few ways you could go around it. Depending on how many scores you have, the easiest way might be to copy the array of scores into a 2d array and use the second dimension to tally the number of scores of each and then select the one with the greatest scrore.
However the way I would do it would be to sort the scores first (asc or desc whichever your prefer) using whatever method you prefer.. I doubt you have more than say 20 scores so which sort you pick will work fine.
After that counting is easy.
I'm suprised antonio didn't cite you on this but --
Your title could do with a few less exclaimation marks...it's hardly going to make us want to answer your post faster if even at all..
Edit: Removed the exclamation marks from it.