A calm way out

Some evenings it goes wrong anyway: tears, a slammed book, a parent explaining louder. Agree in advance on a way out, said by either of you: "I'm getting tangled."

When it is said, you both stop. Take five minutes away. Then either come back to one small question, or write a short note to the teacher saying where they got stuck. A note that says "stuck here" is useful to a teacher.

If the child uses an app that asks rather than tells, point them to its stuck page, so the help still comes as questions, not answers.