For the first question u have a complete grasp on text. Atleast u must read it 10-15 times in ur due course i know text of othelo and galelio galeli is bit long but u have to go through.
Then comes the power of ur imagination.The more ur imaginative , the more ur likely to get good score.Dont follow books follow ur imagination if u think that u can explain things differently as mentionedd in the books, go on but u have to be very argumentative in ur explanation.
IN exxplanation pay heed to following things ...

creation
novelty
relvency and one thing i must add

make ur sentences readable and comprehensible it is not you who r goona check ur paper

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