I agree with Yasser in many points like some of the brilliant students cannot satisfy the FPSC generals and some..............
Any ways I think for success ur observation, analytical approach, ability to write effective English etc etc counts much and above all prayers of ur family frinds and who pray for u
Prayer is the most imp parameter to be fulfilled for success.

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Long, long afterward, in an oak
I found the arrow, still unbroke;
And the song, from beginning to end,
I found again in the heart of a friend