given that the di LR section is getting tougher by the day.. what books or websites are suggested apart from arunsharma to prepare for the same.

I agree with you that DI-LR was the toughest section this time. Now as far the prep is concerned, I would suggest you to join mocks since TIME material only acquaints you with the basic concepts..
Assess and work on the basic skills required to crack the DI and LR questions. In LR, for example, are you able to put the data in the right format before solving the question. In DI, while you had the calculator to assist you with calculations, you would have found it to be useless if you didn't know what to calculate in the first place. 
Solve a DI or LR set every day from here-on for practice. Before solving a set - estimate the time you will take to solve it and then check whether you are able to solve the same in the estimated time-duration and also as to how accurate you are. As time progresses, challenge yourself to solve these sets in a shorter duration of time and with high accuracy.
Gradually move to taking section tests - here prioritizing and solving the "right sets" in the given time limits will be key to performing well. Learn and improve on your prioritization skills as you take enough section tests.
Apply your learning in Comprehensive full-length tests like SimCATs.