The so-called direction means major. There are three most common majors in musicology. This is a relatively large and general division. If you are studying piano, you should choose the piano direction. If you are studying vocal music, you should choose the vocal music direction first. In fact, piano also belongs to the instrumental music direction, but piano is listed separately because there are more enrollment and applicants.
Of course, if you can specialize in multiple fields, that is, if you are good at one of the majors but the other majors are also good, you will get extra points.
Music theory and sight-singing and ear training are basic subjects that all major candidates must take.