The subject of self-study examination is the national or provincial unified examination, and its essence is "self-study examination". Some colleges and universities have aid classes, offering aid courses for self-taught students, which correspond to self-taught subjects and are auxiliary. If you fail in the exam, you have to study hard on your own. Therefore, the so-called "it is very difficult for Northeastern University to take the self-study exam" is not a problem. Let's put it this way, you can understand that the difficulty of self-taught examination in Northeastern University is exactly the same as that of Shenyang Normal University in Tsinghua, Peking University.

No exam can guarantee that you 100% pass. Moreover, the self-study exam seems simple, but it is still very difficult. It's important to work hard by yourself. It also depends on whether the invigilation in your examination area is strict or not.