I'm surprised to see an Indian test taker to score Q < 40
Generally ,It's not hard for an Asian college graduate to get a Q43,44 without any preparation ...at least that's my personal experience...
Remember that my maths was so rusty (had not touched maths for more than 15+ years) that i could barely remember any maths formulations ,and that it did not take much effort to reach around 48...from 48 to 50,51 takes some solid practice and good luck:)
My struggles with Q were mainly about English & basic concepts .... I picked up the basic concepts within a couple of days ,and improved Q vocabulary through working on problems.
It seems that your English is much better than mine . I don't see that you would struggle with understanding the questions.Obviously , you were a top student in school also....
It's really hard to comprehend your situation . Maybe you should consult some other Indian test takers . Indians know Indians the best.