I am able to do utmost 2-2.5 sets in LR/DI. I don't get the time to attempt 3rd set. Can anyone help me know how do I increase my speed in a month so that I can attempt 3-3.5 sets in LR/DI. Thanks in advance

at most*

Select and do easier sets first , that's the key according to me

Everything depends on your choice of questions, chose questions wisely, the skill comes mainly by giving mocks.. So give more and more mocks and while analysing see whether ur choice of questions was right or not..

Set Selection then Order them according to your preference and strength and you might also have to leave sometime if you realize that you are not going moving forward. This will save you some crucial time.