Desperately want to increase my Quants from 40 to 50

Hi Guys,
MY DS is pulling me down. Please HELP


I have been a silent follower of Gmat club for the past few months.
I am aiming for a score of around 700+

I am consistently getting my quant score in the range 38 to 42.
I really want to increase the score to 50 in 2 months.

I have identified my problem area. While I am getting almost all correct in quants but my DS is what pulling me down.

Can you guys please please please suggest some ways of improving my DS?

Thank you.
Soma