This article on the BBC makes some sensible points about hiring tutors.
Parents need to think hard about what’s best for their individual child.
It’s not just about the exam grades…the best tutors explain things so that the student is equipped and motivated to dig into the subject on their own.
You tend to get what you pay for. If a tutor has been working for some time, then they are unlikely to be incompetent. If they have been charging a lot, then they are probably worth it.
Many folk who are well qualified in a given subject can’t teach it to save themselves.
There is no such thing as a hard exam…it’s a sign of deficient teaching and/or insufficient student workrate.