Actually OP, you should approach the school and tell them what is going on.
Your daughter and the family are being emotionally abused for several months, she is clearly stressed and struggling and may need support from them.
I think you can tell your husband you have done this.
Your relationship is over.
How you have allowed this to continue for months coming up to exams is beyond me.
I would filet my husband if he did anything to upset our children coming up to their exams, much less tolerate his emotional abuse of them for several months.
Take control of the situation.
Tell him your marriage is clearly over.
His abuse of you all has impacted the children and you are informing the school.
Men like the little prick you are married to, think they can treat their wifes and children badly behind closed doors.
Telling him that you are involving the school pastoral supports and want him out, is the way to go.
I mean this kindly, but you have tolerated this bullshit fot too long, to the serious detriment of your child.
She will NEVER forget this.
She WILL wonder why you didn't challenge this behaviour when it was so impactful on her at such an already stressful time.
She has and is not being protected from his emotional abuse of her and her siblings.
This is completely unacceptable.