JEE

It's nice to see your query. Before I answer your query, here is some information that you should know. Even though percentile is of vital importance, it's the ranking released by NTA at the end of different sessions that matter most. NTA will announce ranking after the end of session of exam this year. In this, they will combine percentiles of both sessions with for those who appeared in both, best of two will be selected. Then ranking is released.
Last year students with ranking about 8000 got admission. I am attaching a link to help you understand.
https://www.shiksha.com/college/nit-kurukshetra-national-institute-of-technology-23159/cutoff
Best wishes to you.

Best books are here:-
1. Concepts of Physics (H. C. Verma)
2. Understanding Physics (Set of 5 Books) (DC Pandey)
3. New Pattern JEE Problems Physics for JEE Main & Advanced (DC Pandey)
4. Wiley's Halliday / Resnick / Walker Physics for JEE Main & Advanced) (Halliday, Resnick and Walker)
5. Problems in General Physics (I. E. Irodov)
6. Engage Maths Set Of 5 Books (G TIWANI)
7. Advanced Problems in Mathematics for JEE Main & Advanced) (Vikas Gupta & Pankaj Joshi)
8. Problems Plus in IIT Mathematics (A Das Gupta)
9. Master Resource Book in Mathematics for JEE Main
10. Chemistry NCERT Textbook
11. Problems in Physical Chemistry for JEE Main & Advanced) (Narendra Awasthi)
12. Organic Chemistry (Morrison and Boyd)
13. Concise Inorganic Chemistry (J. D. LeeBuy)
14. Errorless JEE Previous Years Chapterwise & Topicwise Solved PapersDisha.

JEE Mains Exam Preparation Tips and Tricks:
1- Make a Realistic Timetable that can be followed.
2- Self-study is Important.
3- Learn to Manage Your Time Effectively.
4- Choose the Reference Books Wisely.
5- Solve Previous Year's Papers and Mock Tests.
6- Always be Curious to Learn.
7- Revise as Much as You Can.
8- Always Have a Positive Attitude. Exam Day Tips to Prepare for IIT JEE Exam:
1- Don't bring up any new topic.
2- Revise only essential topics according to the syllabus Avoid studying for lengthy periods, eat well and healthily, and sleep early and soundly.
3- Arrive at the exam center 40 to 50 minutes before the exam.
4- Don't study anything new before or on the day of the exam.
6- Take a quick look at the paper.
7- Time management is essential.
8- Examine the questions thoroughly.
9- Make no wild guesses.
10- Don't spend too much time on one question Be upbeat and self-assured.
11- Make every effort possible. For more information, you may visit the Shiksha JEE Main exam page. (https://www.shiksha.com/engineering/jee-main-exam). I hope this will help you.