@ Sumyra
What is your qualification? How long have you studied chemistry in your educational career? My advice was to candidates who have studied chemistry only uptil F.Sc. If you have studied it at a later stage too, and have done well in 2011 exam, then there is no need to change the combination.
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Chaudhry Nauman Zafar
Whatever human mind can believe or conceive, it can achieve.
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