Can You please clarify, if it ok to answer the question 1(a) first and after 3rd question 1(b) etc etc.... Will this presentation have any negative impact on my marks?
you can change sequence of main questions, but try not to change sequece of sub qustions. E.g you can select 4th Q first for answering and 1 Q in last, but try to solve all sub q of main q in sequence