I tutored private A level students when I was a post-grad. Because it was a private college they didn't really worry about whether I was qualified or not – they were raking in a boatload from the rich parents.
Bit of biology on a saturday morning @ £20 an hour gave me enough dosh for a decent weekend. The most custy and rewarding job I think I have ever done – most of them were incredibly intelligent Asian kids and on for straight A's and a trip to Medschool. I'm not sure my teaching style was really that important, they would've picked it up anyway.
But the rewards came with the couple that were struggling, it was so great to get that 'lightbulb' moment when they could finally visualise what was going on. 🙂