Brother although I am not a qualifier but in my opinion never ever follow Jehangir Books for Essay preparation. I cannot comment on their written expression as they have a very good teams of elite people but nearly all the fact and figures along with data presented in those books is either biased or outdated.

I am saying this because a friend of mine did the same and he bought those so called authentic notes of Jehangir that were advertised in 2012 before exams. Those notes cost him 1500/- per subject but of no use.

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True knowledge exists in knowing that you know nothing. "Socrates"