i am able to score 15 in varc and sometimes my score is 7 or 8 even i analkyze it i get the the way but the score is not increasing need help

Some tips:
1) Read slowly and try to understand the passage. Try to make a story in your mind when you are reading the passage.
2) VARC has minimum 2 factual RC's , try to attempt those, for now don't attempt inference based / psychological RCs.
3)Practice para-jumbles and Odd One Out. These questions dont have negative marking.
I would suggest you to take full 40 mins to solve only 2 RC passages and once you get comfortable then move ahead and solve 3 RCs.
Best of Luck.