I opted US History and appeared in CE-2014. I am not satisfied with my performance in US History though I like that subject and also created an interest in it. Still I was little confused while attempting the written exam. The problem is may be I didn't study well for it. Kindly seniors help me out, I do not want to replace it with any other optional because I have no other choice. Give me some notes or suggest me some good books so that I can prepare it well.