Hello people!

I need a little help here. My center for Viva Voce in tentative schedule is Islamabad, but I want it to change to Lahore. What's the procedure? A simple application? And secondly, if I plan to appear in 2013 as well, then when will I have to write to FPSC so that my Viva schedule does not overlap with my CSS 2013 written? Now? Or when they announce the date of my Interview?

Being grateful in anticipation