For the note-taking-before-math issues, it would be reasonable to have all of his teachers in classes with extensive note-taking requirements (not just the ones before math class) give him a printed outline of the material with the main points filled in but with room for additional notes, or to have someone scribe notes for him. (Someone scribing notes for him could be as simple as giving him photocopies of the notes of another student who is a good note-taker.)
Reducing the volume of written work required is generally considered a reasonable accommodation for dysgraphia, and as the volume of required writing in his classes goes up, including this in the IEP is likely going to become essential.
Dysgraphia accommodations