Hi
We just finished K and our DS was initially one of those the teacher was worried about because she saw someone who was barely paying attention, couldn't sit in his seat and had trouble writing. She didn't know much about him for at least 6 weeks because he rarely said anything. We chose the let her figure it our approach because we didn't want to come across as "those parents". But it was painful as the testing for reading was slow, and at first the assessment was so low in terms of where he actually was, not sure why, but they did 3 more assessments and i would say its pretty close - they kept going he was assesed at 4th grade level, sven so I had to gently ask that he be directed to appropriate books in the library and I would not say they were keeping up with his reading level in terms of available books. But what was available for the advanced readers was age appropriate chapter books. And that's ok because he enjoys them, even though he can do more, the humor is his right on for him.
What was funny, at one of the conferences the teacher was gushing about his progress, and werent we pleased, and we very gently pointed out the progress was in his comfort level, not his abilities, she was finally getting to see who we see. She was a wonderful teacher and ultimately became his biggest champion but it took a long time for her to see him. But she worked to find him too, once she started seeing little glimpses she went digging for it. She was wonderful in that regard. No school will be perfect - we can't get a skip - and they will likely never meet all his needs but because of her it's been pretty ok. I consider it backfill for all the things we didn't focus on while letting him go deep.
Another view from the peanut gallery

DeHe