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@priya‌ if you are worried, go with your favourite topic first, at least your least favourite topic will be the last so you wouldn’t lose too much.
My strategy is to move as quickly as possible, if you know how to solve it but just needing a little more time to think then go for it, however if you are not too sure at all, put a big marker on the question (in the question sheet NOT your answer sheet) so you will come back to it if you have the time.
Also, have a milestone on the number of questions per half an hour or an hour.
For example:
First hour: you should reach question 40
Second hour: question 80
Last hour: question 120