environmental management oct 2013

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I am thinking to go for an extra subject in the May 2014 session with the other six science subjects. I have short listed two of them, History World affairs and sociology. Which one is better? Which is more likely to yield an A or A*? I have got six days to decide! Your suggestions?

Socio without a doubt. I gave it unprepared in my day.
Skimming through the book would easily get you an A* with a few papers.