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Hello ma am ,i am in 11th. I am really serious abt getting in iit . I stay in p.g. and utilize max time for my studies. I have that my graph goes zig zag in my monthly test at my coachin class. I want to really improve my accuracy and get in air-100& else i wont get c.s. at iit b which is my ultimate goal. plz suggst hw do i further increases my concentration and accuracy..thanks