there are many questions on data structures and algoritms (queues, stacks, trees, sorting, searching etc), networking (protocols such as TCP/IP, DHCP etc), OS concepts and OOP/ software eng concepts and DB concepts.
In addition to these, there were occasional questions on AI/intelligent systems, compilers, theory of computing etc but they are in less numbers compared to above listed topics.
I can't remember the exact duration of the exam (1 or 2 hours). It was a computer based one.
Basically if you get your CS fundamentals right, you will face the exam well. Good luck!