Edit to add the post I was replying to, which Mumsnet thought might have been deleted.
Edited to try again. I don't know why it's not working.
Wow - that's good money! Is there a way to get a tutoring qualification without doing teacher training?
I don't know of any such thing as a tutoring qualification. Parents often employ university students, which can have a lot of drawbacks but positives, too.
Once you've started you can get other work by word of mouth, which is why I suggested volunteering first.
You can charge what you like / what the market can bear but be aware that the higher the qualification the more people charge, in my experience. My head of department was charging £100 an hour for A level ten years ago, but that was to wealthy families and he basically didn't want to do it. He said local tutorial colleges were charging £80/hour then so he asked for more.
We do know the syllabus inside out and backwards, but you can prepare for all that. Somewhere like this website has lots of past papers with worked solutions and the examiners' markschemes.
Also, plenty of places advertise for tutors, some I'd trust and many I wouldn't. You could also try searching on the TES (Times Educational Supplement) website for tutoring opportunities, many of which seem to be online.