It happens in New York City all the time.
Many parents and kids do not even know what type of tests were given in their school district. It's not like SAT or ACT. If someone has practice before the actual test, he/she may have unfair advantage over other kids.
Some practice such as SCAT from John Hopkins have sample questions in their website. Those questions will not show up in actual test and defintely OK and actually encouraged to do it. If you try to get something like OLSAT, what you get from internet may probably be the actual test. That would be a big NO. Your kid might have said he/she have seen those questions before.
That probably a honest mistake on your part. I would wait for the different format.
