Public school game in which score is four (5)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Well, it is possible, I suppose, that this is a reference to the Fall Efficiency Scale score, in which case it is F(IV)ES.    I just biffed the answer and hoped for the best.   Comments?  Well, my explanation is imaginative, and might work in Mephisto, but Kevin’s is probably the correct one!