@ jawad.
Well ,Read the questions and answer them briefly and concisely.do not be more elaborate,stay to the point and answer in an analytical style.
read the question ,every question focuses on some specific points,answer it in the same style.
some questions demand application of your concepts ,so no need to reproduce your concepts about the topic.just apply your concepts to the given problem.like you apply a formula to solve a numerical.
before attempting ,read the questions again and again,and try to focus what it is about.
all the best.

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The gem cannot be polished without friction nor man without trials.