Timing strategy for IR?

Well, after reading through a couple of threads, i feel most of the folks are comfortable with the IR section. Today i gave my MGMAT cat-2 with IR and was humbled by the IR score (2.5) as well as by the questions itself.(3 questions correct in 30 minutes , wasted 24 minutes for nothing )

My weakness in data interpretation came forth when i got 5 out of 8 incorrect; i feel i also messed up my timing which resulted in 4 questions being unanswered.The questions which might have been easier but never had the time to face them.

I will try to improve on my Data interpretation skills in time, however, i feel that it might not be possible for me to attempt all the 12 questions with spot on accuracy in 30 minutes.

I want to know that since this section is non adaptive is there any effective strategy in selective attempting "some particular questions" while leaving "some other questions" for guessing, so that the chances of losing time without suffering on accuracy is minimal?
I feel multisource reasoning consumes a lot more time and the corresponding rewards are less? at least for me.