Tutoring has never been about formal assessments. Tutoring is about strengthening academic skills with constant informal assessment and parent feedback. Tutoring Centers that offer formal assessments are selling you programs determined by how the student scores on their "assessment". The problem with this is your student may need help in Geometry but the program they offer has the student coming in 5 times a week working on place value and division. It's overkill. What's worse is that the students immediate academic needs will not be met. A tutor's primary responsibility is to focus on the here and now.