"Every student is different." But I'm not here to bore you with platitudes. Everyone does learn in a different way, and everyone can benefit from the right fit for tutoring and test prep. Some students look for a tutor with a specific background, specific interests, and of a specific age. Sometimes I wonder, though, is this a reactive motivation, rebelling against the approach taken by a teacher you don't love? I believe student is really seeking is that elusive human element, a rapport with the person in whom she is investing hopes for achieving academic goals.
Think about a grandma--less agenda, right? Non-judgmental.
So what is good about a grandma tutor? Here is what I have been told: minimal invested ego; I have proved or disproved my abilities long ago, and am free to focus on the student. My style is student-centered as opposed to "program" centered. Who is this about? I work for you!
I also work with non-academic factors that influence both learning material and performance on tests; I know what is important to teach along with the how-to.