Sometimes homework is needed now and then. t is normal for students to be wary about receiving homework from tutors. A responsible tutor will give homework now and then especially when exams are approaching.
Regular changes of teachers and tutors are disconcerting because of the disruptive effects on the sessions and students.
It takes time to build up rapport and for the tutor or teacher to earn the trust and confidence of the students, so having a succession of different tutors is a no-no for students. It also takes time for the tutor to help the students and to see results of that help.