I am also graduate in Software Engineering and thinking to opt for CS as optional subject, don't have much knowledge about how to really prepare the syllabus. The topics of syllabus are known to me as all of those belong to my undergrad courses so i'm not afraid but at the same time looking for some starting and ending points because 100 of books can be written on every single topic. So i suggest same for you determine the ending points first so you can prepare it within time. If any of you (Computer science people) looking for collaboration then please let me know. (but keep in mind i am also a beginner in CSS prep field)