Give as much information and be as detailed as possible about what you need help with. By supplying this specific information tutors are better equipped to immediately evaluate how their particular area of expertise matches with your particular area of need. Once you do pick a tutor they can immediately begin addressing the issues from the very first lesson. The subject and grade level often do not do enough to shed light on the specific problem areas.
For example if you need help with reading say a bit more about where the problem lies. Is it a phonics problem, is it a comprehension problem, is it a vocabulary problem, it may even be a motivation problem. Simply ask yourself this question: 'What is preventing (student) from doing well in (subject)?' Then include your answer in your post for tutor help. It’s a bit more work up front for you but is worth the time to get the right fit.