If you are willing to provide more details I think it would be easier for people to respond helpfully.

From what you said so far, though, a couple of things might be worth thinking about.

Swearing every day turns studying into a power struggle.

You can't win that battle.

You might be able to force him to do some studying, but you cannot force him to want to study.

He might decide on his own that he wants to study, though, if studying doesn't seem like a concession to you in a broader power struggle.

You catch more flies with honey, as they say. Resolving to stay calm, positive, and supportive with him at all times, no matter what happens, and apologizing if you slip up, might help him to allow you in.