I'm interested in applying as a math tutor in my area for tutoring centers. The highest math I took(letter grade D) was real analysis but after dropping out of college for a year now I practically have zero memory of what I have done these past few years (I got A's on all my math until calc2). Depending on what math I'm tackling, I might be able to scheme through some sample problems and look over some formula but at the top of my head I really don't know the law of sines, equation of a hyperbola, or even differentiating and taking an integral. Basically I know what's going on but if I am sat down and asked to do a bunch of random math problems, I would not have a clue where to begin with.

1. Should I apply and sell my self short(then maybe ask for a raise as I review more math)?
2. Should I just review algebra to calc2 then apply?
3. Suppose you are the only person to help a student and you come across a problem you have no idea to solve at all, what are your options? Are you allowed to find a solution online or is it even acceptable to review the necessary materials for 10-20minutes knowing they(parents) are paying by the hour.
4. How do even parents and employers react when you just cannot help with a certain problem?