I dont really know what you should do for that. but i think one of the best thing to prepare your "pair of words" from is from the old papers. those do not necessarily have to be CSS papers. they could be any papers, say, PMS or other competitive exams. also you find most of them being repeated. once you get through many of the papers i am sure you will be ready when the day for the final exam comes.
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Mahmood Khattak
Pakistan Customs Service
36th CTP
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