Should I go directly to the interview?

In fact, it is not polite to go directly to the interview. I suggest you wait. As for the relationship you mentioned, it's actually hard to know. Some are acquaintances (so-called free advertisements recruit people) and some are liars. Of course, there are also liar companies in formal intermediaries.

Zhaopin

These recruitment networks are also full of scammers. Don't forget to send resumes and other interview notices to those companies that are interested in you on the large recruitment network. The chances of your discovery should be considerable!