i am trying to prepare for competitive exams.i purchased halliday and resnick.when i try to learn a chapter.i first go through the theory part.then when i come back to solve the numericals,my mind goes completely blank.i understood the chapter but when i come up with some tricky questions,i just dont know how.the same goes with chemistry and math.my iq is very low.what should i do to to solve them?
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