Which subjects to focus for getting rank under 500 in C CAT exam?

C-CAT is very easy exam which is meant to check your understanding of basic concepts in C, C++, Data Structures, Operating Systems, Computer Networks and Aptitude. 

Just prepare these subjects and you will be able to crack it easily.

If you are preparing on your own then I will suggest to solve more MCQs(Multiple Choice Questions) which will boost your confidence of cracking C-CAT.