While she was part-way salvaged by exposure to competence in a wheelchair, I'm afraid nothing could be done for the looming shape himself and nothing really can be done so long as Elly lives. Most of his behaviour is rather sadly explicable because he wants to do something that's futile, self-destructive and antisocial: trying to get the attention of a woman who can't give it and whose opinion is the most irritating kind of worthless: the self-pitying sort. We're not only dealing with someone who can't help but think that any choice he makes that doesn't mesh with her idea of the good means that he hates her and wants to destroy her, we're also dealing with a deluded zombie who can't praise him lest he be destroyed.
What I expect will happen is that after Elly finally meets her cremator, the shock and anger that no longer being able to finally get the love that was never really forthcoming will probably finally get Mike to see that the mother he wanted to have look at him wasn't actually worth the effort because she refused to be impressed by anything he did that didn't allow her to live through him. This means that we're probably in for his taking a refresher math course so he can help the kids with homework. It also means that he'll finally really get along with his fellow victims Liz and April. All that has to happen for Mike to have a happy ending and to love school is to end Elly.