There are two kinds of exams, and some positions are not limited to majors, such as clerks and officers. As long as these positions can get the required academic qualifications. There are many applicants for these positions, and the competition is fierce.
Some positions are highly professional and require graduation. The number of applicants for these positions is small and the competition is relatively loose.
After the announcement, you should find a position corresponding to your major. You don't have many professional positions. Maybe the archives will recruit some, but it is not necessary to lack this position. Then you can apply for an unlimited professional position.