hmm got what u r saying....
avoid writing on controversial issues, be them of any "kind"...
be impersonal..............no need to mention any names(my experience,,u may disagree)
follow the pattern discussed here on the forum, esp by those who have made it.
dont be too critical, of course u have to highlight the goods of your Govt. too and u must...
and above all Pray Allah to Help you in anything you do for the CSS..
be the lady luck with you, my prayers for u and all of us..
regards!!