Dear admiral....
Zoology and psychology are high scoring marks and easy to prepare as well.But looking at psychology papers 2013,it can be predicated that its no more an easy task.But,if u've grip on subject and u think that 2013 papers are handy then u may go for psychology.You must be aware of the fact that psychology can't be more tough than 2013. On the other hand,if you are good at zoology and can prepare it meticulously,go for zoology.

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"Mind is everthing;what you think,you become". Budhha