Most teachers just teach a classroom in something like mathematics, geography or grammar. However, there are also teachers who give additional lessons to a single student or a small number of students.
An example situation could be a teenager who is working really hard to get nice grades for mathematics but he is failing all the time. He needs extra lessons to succeed which can be helpful in some situations.
Is there a nice word for such a teacher and a word for teaching such lessons? In Dutch, there is a word "bijlesleraar" where "bijles" means "additional lessons" and "leraar" means "teacher". An obvious translation could be "additional lessons teacher". However, when searching on linkedin, only Dutch people seem to have this profession.....
So it is likely to be an incorrect term, translated from Dutch to English literally.
So what is a good term for an "additional lessons teacher"? Is there also a nice term for teaching such additional lessons?