The ratings are evaluations by students who have taken tutors' lessons and are calculated as a percentage(%)

using the following 5 criteria.

The reviews are feedback the tutors received from their students.

OnTutor has the Tutor Rating System according to the tutor's ratings.   What is the Tutor Rating System? >>

The categories are:

You can see the ratings on both the search result listing pages and on the tutor profile pages in more detail.
On the rating details page of the tutor profile, you'll also see:
○ The tutor's overall ratings on each criteria
○ The number of ratings the students left
○ The number of courses the tutors completed
○ The feedback by students