qa, varc fine. dilr not good.

so, i have been preparing and giving mocks (ims and cl) regularly . Now, i am getting fair marks in varc and qa, but not in dilr. like at max i am able to solve 1 set. Outside that time limit. i am able to solve all the sets without any external help. I would also want to know where can i learn dilr from ( preferably in hindi, not hinglish). Hindi because learning in hindi stays in my mind for good time.