What types of customers have you worked with?
Probably the most common subject I tutor my students in is algebra. I have helped many students with algebra. I would say the most common test students need help with besides chapter and final exams would be the math section of the SAT.
What advice would you give a customer looking to hire a provider in your area of work?
Make sure that your tutor has experience. Remember the old adage, "You get what you pay for." Don't sell yourself short by getting the least expensive tutor around or the least experienced. Also, what you really need is someone that will help you with beliefs, knowledge and actions. It's not enough to for your tutor to just have math knowledge.