He could have N(V)LD. My dd1 (5th grade) has a tentative diagnosis of NLD. I'm not sure it really matches up for her because she has some anxiety issues that I think may have clouded the testing she had done (almost 2 yrs ago now). However, I did see some markers that fit when I researched it. Check out http://www.nldontheweb.org/ if you haven't already. We had a private eval also and my experience with public school this year is mostly good, but I did get the impression that they basically thought if she wasn't causing a big ruckus she wasn't a big problem. There are many other kids with bigger issues than she has, but, of course, I want her to do as well as she is able to do. We're headed for a small charter school next year and I think that may allow her a little more flexibility. She struggled in math this year which is consistent with NLD, but she didn't have a great math teacher (many of the other parents didn't like the teacher either). She did exceptionally well in science, though, and also excels in reading. She has some minor struggles with writing (that ol' blank piece of paper staring at her) and basically did fine in everything else. She struggles with organization (consistent with NLD and not my strong suit either) and is easily overwhelmed by homework assignments (and cleaning her room, too).
best of luck!