I know someone will come up with a sleeker solution than this, but off the top of my head, I'd write a query with four additional fields, like this (code is approximate):
Score1:Iif([Mytable]![Score] = 1,1,0)
Score2:Iif([Mytable]![Score] = 2,1,0), etc (for 3 and 4)
Then you can write a second...