I am stuck with 30 marks in VARC pls suggest me how can I improve?

what do u want more bro? it is enough to get 99+. plus cracku varc is a bit more difficult than cat. So in Cat u will be able to attempt more ques. Just maintain it to 30 and if u want more than elimiate ur wrong ques. it will boost score without pressure.

try to read more

You might not have fully understood the passage. Many of us run through the passage to save time. I would suggest maintaining a consistent pace while reading. Imagine how you might read if you weren't able to read the passage again. This would also save a lot of time while answering questions as we tend to go back to the passage over and over again if we haven't fully understood it. For reference, check the VARC live faculty attempt by Maruti sir (DashCAT 5), how he runs the cursor through the RC, and the time he takes. Hope this helps!!