Our expert says:
So he does NOT show this anger and stubbornness with his new dad, and only with you ? You're right, of course, that your own anger, however understandable, only complicates the matter.
Concentration can be influenced by many factors, and maybe he isn't as content with the re-marriage as it appears on the surface, and this is reducing his concentration,
It may be useful for him to see a child psychologist who can use other methods to help him reveal what is troubling him, and could then usefully suggest to you ways of handling it, more specifically than we could speculate here
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