Finding a proper teacher
There are lots of websites and agencies advertising online tutoring jobs for teachers, and a lot of these sites and agencies will request that the teacher has all the usual particulars.
An up-to-date CRB and a recognised teaching certificate are normal. Not every tutor will choose the agency route and can choose to advertise there services anywhere from, their own websites to an advertisement in a shop window.
Just because a math teacher advertises in a shop window doesn’t necessarily mean that they will be any less efficient in subjects such as geometry for example. They may just want to keep it small or may have just started tutoring due to retirement, and many other reasons. Finding a proper tutor maybe down to the certifications they have and appearance to some, but it is their style of teaching and adaptability that would make them a more efficient tutor.
Finding a teacher that is able to adapt the way they teach will be hard and may require a bit of trial and error. A lot of Indian and Pakistani people may prefer an English teacher that is of a similar background. It is there choice and it doesn’t have to mean that they are discriminating against others. Different people form different cultures may feel more comfortable with somebody understands the client as well as the material that is being taught.
In order to find a proper teacher ensure you read and feedback that is available about them first. Better yet, if they are local ask friends, family and even acquaintances if they have used them before. Word of mouth is worth its weight in gold. Finally you could always get good recommendations from a school or college, they should know of any teachers/lecturers who offer a good service both internal and external to the facility.