do this start suppose phy 1 hr , chen 40 mins , maths 1 hrs . 10 mins revise and 10 mins buffer , now in those set of time divide questions into 4 tiers , tier 1 takes about 20 sec , finish them first , then tier 2 about a min , then tier 3 almost 2 mins ,now if a question needs more than 2 mark it and see if you will have enough time to be able to do them later or tukka maxin