The training center can be understood as a small training school, because its place may not be very big, for example, on a certain floor of a business building, there are reception rooms, training rooms and offices. Not too many people.

teacher training school

A training school, needless to say, is a training school.

Education consulting firm

Educational consulting companies are not qualified for training in essence, but many of these companies are also doing training, but they are not qualified to do it, that is, they have exploited the loopholes. Training is not allowed if someone checks it.