The examination difficulty of public elective courses in universities varies with the course content and the requirements of professors. Basically, each course has its own unique learning difficulty and assessment method. But in general, some public courses may be relatively easy, and some may be relatively difficult.

The learning difficulty of public elective courses depends on your interest and background knowledge in this field. If you are interested in the subject and have basic background knowledge, it may be relatively easy to learn. However, if you are not interested in the subject or lack background knowledge, learning may be more challenging.

In addition, the professor's requirements for the exam will also affect the difficulty of the exam. Some professors may require you to master all the details of the course, while others may pay more attention to understanding and application ability. It is also important to know the teaching style of the professor and the requirements of the exam.

To sum up, the examination difficulty of public elective courses varies with the course content and professor's requirements. Before choosing a public elective course, I suggest you know about the course content, the teaching style of the professor and the experience of previous students, so that you can better evaluate the difficulty of the course and make appropriate preparations.