I think you have the right to know the scores. At our public school, they take the test and they give the parents the results a couple of months later. They also let us know the kids are taking the OLSAT in advance. I would politely ask the teacher when you will get your son's results of the OLSAT - if they say they don't release them then you can go to the principal and ask why. But I suspect they will just give them to you.