The syllabus of the SS component for the combined Humanities are easily retrievable from the SEAB website.
At first glance the syllabus content look overwhelming, but on a closer look, the focus is more on key concepts and core content. Many illustrations or examples in the textbook are actually dynamic content which helped to strengthen your understanding of the core concepts. The specifics of the dynamic content will not be tested, but rather they will be used as examples/illustration to show your understanding of the concepts which you are supposed to learn.