Generally speaking, if an educational institution has its own fixed office space and a certain number of local staff engaged in education and training for a certain number of years, it is more reliable. Because liar companies basically change places with one shot, it won't last long and it won't be big.
It is also important to pay attention to the local registration policy. Many places are qualified for post-examination, that is, they do not review their qualifications when signing up, and then go to the qualification examination if they are qualified. In this case, it is easy to register, but it is difficult to ensure that you pass the qualification examination after passing the exam. At this time, we should pay attention to the promise of the newspaper. If he says he just signed up, it has no practical significance. This requires institutions not only to register on their behalf, but also to provide the necessary information after the exam to get the certificate.