No, It's not ok. Is there a parent advacy group near you that will help you in dealing with the schools? Support groups are a great help in dealing with the schools. They can tell you who to talk to who not to talk to what to say and what not to say to get what you need.
To prove regression request the school to have him reevaulated at their cost by an outside party. If at all possible have the same tests done that were done before. Have as much done as possible and I'd recommend starting with his weak areas.
I can't think of what the meeting is called. But you can request a meeting of the FULL IEP team(if someone doesn't show or they try to schedual last it isn't in you best interested to go to that meeting. Make sure everyone is there.) The meeting wouold just be a review of the tests and such.
After you have the tests done go through the results with a fine toothed comb and note the difference where he is behnd and where he has advanced. No advancement does NOT equal progress (for some reason schools think it does.) Instead it means that something is not working.
Take a copy of his IEP and go through it and see what they are and are not doing. Keep in mind that unless it was written down it doesn't count. Record the IEP meetings. Bring someone who has your grandson interest in mind to be a non-emotional supporter.
Take lots of notes. When you have all your information on his current adn previous test results and the information from his IEP write a nice long letter outlining your concerns. Use the test results to back up your claim. Talk about how he has lost skills. It is no place for emotions or blaming. End it with what you think will be the best course of action and your confidence that they will do this promptly. Include the section of IDEA that forces schools to have a set time to reply. I'm in a hurry and can't think of it off the top of my head.
Send it to his schools special ed cordinator, his teacher, the districts sp ed cordinator and the superintendent.
When you talk to the school document who when why summing up the responce you got.
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