First of all, The Book of Changes is a classic work of China in ancient times, which talks about a philosophical thought and a prediction method. Learning the Book of Changes requires in-depth research and understanding, rather than simply spending money to buy some materials. Therefore, it is probably a scam to spend 4980 yuan on the Yijing course.
Secondly, swindlers often take advantage of people's interest in mysticism and supernatural phenomena to defraud money. They may claim that they have unique knowledge or skills of the Book of Changes, which can help people solve various problems, but these claims are often false. These swindlers may make people believe that they can predict the future and change their destiny, but these are impossible.
Finally, if you really want to learn the Book of Changes, I suggest you find a formal learning institution or master. You can find books related to the Book of Changes in the library or bookstore, and you can also attend some lectures or seminars on the Book of Changes. These methods may take time and energy, but compared with being cheated out of a large sum of money, these investments are worth it.