Guys, kindly stop this confusion. I assume you are all grownups and CSS aspirants? If yes, kindly go to FPSC site: http://www.fpsc.gov.pk/icms/user/page.php?page_id=373 and read all the FAQs before you start your preparation. Many questions such as use of calculator in general ability paper, passing marks for interview, proportion of mcqs and subjective part in papers can be found there.

Here is the part that answers your query