Welcome Eco! You will definitely find lots of people here with similar stories, and some great advice as well. DS9 is 2e, but we homeschool now, so I'm not dealing with his IEP at the moment. But we've had to drop out of other activities because the adults involved had no clue how to help him succeed, and were mostly unwilling to take my advice. We still haven't figured out exactly what that second "e" is, either; it's a work in progress.

If you have the energy, I would definitely fight the school for a comprehensive evaluation. But do keep in mind that they probably don't see a lot of kids like yours, so their evaluation might not tease out certain problems, or they may reach conclusions that someone more expert in 2e issues would not.