Is it better to pay one credit card off to higher a credit score or split amount up between cards?

I am looking to buy a house and my credits is where it should be but my husbands is not. We payed his credit cards down a little and are waiting for his credit score to change. I am not sure how long it takes but also I am not sure if it is better to pay one of the few cards off or split them between the few cards. I just need it to go up 25 points.

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