dear brothers and sisters,please focus on your preparation instead of discussing the test.you all are graduates and you are discussing futile things you ppl should be very much clear that nts test doesnt allow calculator so without calculator you cannot expect of solving any problem.second thing is that For AD Ops different qualification holder were eligible for the test that is why there is choice of solving 6 out of 10 questions.attempt that question that you feel is related to your qualification. i hope your ambiguity will sustain no more