Hello mekalasailakshmipriya

With only 9 days left, you now dont require books but i would suggest you to go with the previous years papers and solve them on;ly as much as you can. I would suggest you to increase your stamina and time of sitting to almsot 10-12 hours in a day.

Solve only question papers of JEE Advanced, though none of the questions will be repeated but it will give you an idea of what kind of exam it is and how the level of toughness is. SInce you have cleared JEE mains, so you must have some strengths also, focus on that and solve those chapters thoroughly from the past years paper of Advanced.

Make your strengths the strongest.

You are out of time now , so dont go for reading and practicing because there isnt much time for that. so, you must go for past years question practice and take a 6 hours test a day before from one of the test series paper or any recent JEE Advanced paper.

Always try to sit for 6 hours at a go! This will make you habituated with the exam scenario.

And if you are well versed with the chapters and pattern of JEE advanced then i would suggest you to directly move on to tests.

manage you time well these 9 days and dont take too much pressure of performance.

Hope that helps!