How to Prepare for Exams and Score above 90%?

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It is required to get 40% marks to pass an exam . A candidate score 200 marks and failed by 8 marks . What were the maximum marks of that exam ?

How many xx must a man toss a fair com so that the probability of having at least one head is more than 90%?

Shabana scored 736 marks out of 800 In her exams. What percentage of the marks did she score ?