I have Arun Sharma Quant latest quant book , and also coaching is providing Study Room Question .. So from where should I solve the questions for practice ? Pls ans unbiased ..

Maruti sir scores 100%tile every year, and Arun Sharma has not scored 100%tile a single time. So, stick to the study material of Cracku, it's more than sufficient :))

You can start with the study room material. Make a target for a particular topic,i.e., suppose you finish n topic tests for x topic in z days and then can switch to LOD II of Arun Sharma for that particular topic. Finish it. Then come back again to the study room and commence with a new one. The cycle repeats.

I think study room has plethora of questions for now .You will not get extra time for books and books are looking at current exam pattern not that upgraded ,you stop getting feel of solving questions under a timer.Study room atleast gives it and also helps a lot in improving speed over time

I think start with coaching material first then if you have time go on different books