Tuition has scheduled its own mock test in the same week as school mid-terms

My elder daughter, 10, is in class 5. Her school mid-terms start next week. Yesterday the tuition teacher announced a 'practice exam' for the same week, three papers, on the evenings between school exams. I understand the intention. But a child of 10 cannot sit a school exam in the morning and a tuition exam in the evening and do justice to either. I have not yet raised it with the tuition teacher, partly because I suspect the answer will be that the other children are all doing it. Has anyone negotiated something like this with a tutor without it becoming a standoff?