A national certificate refers to a certificate that you take in accordance with the standards of this country under the regulations of this country. Every country has its own standards. Just like when you buy clothes, your size is not necessarily someone else's. Therefore, the general national level is also universal in China, and some foreign countries recognize it and some do not. If you take the four internationally recognized certificates, your chances of being recognized abroad should be higher, but you have high requirements for English. You can try if you want to learn.