First things first.Lot of people might find this really stupid, but I believe it will help.Change your name from "mathphobia" to something like say "Conquer Quant" or whatever you like, which is positive because this reflects the state of your mind.
Second, as I see you are from India, I am pretty sure you can easily achive 47-48 in Quant with a bit of effort and confidence as the GMAT Quant is already covered in the lower secondary level.
So,
1)Stop seeing yourself as someone who is weak in Maths
2)See yourself achiveing high scores.
3)Do all the questions in
OG
4)For some additional practice, do the 1000 PS and DS series
5)Once you are above 44-45 level mark, start solving questions from the Math forum here