Here are some of the useful tips you can use while preparing for KVPY SX exam,

• Make sure you are thorough with the exam syllabus and pattern
• Try to make a study plan which is suitable for yourself and helps you prepare well for all the subjects
• Keep Practicing as practice makes you perfect
• Solve as many previous years question papers as you can as it will give you an idea of how the questions are asked as well give a confidence boost.

For a more in depth preparation tips please click on the link below.

https://learn.careers360.com/science/how-to-prepare-for-kvpy-sx/

For syllabus visit the link provided below:

https://school.careers360.com/articles/kvpy-exam-pattern

I hope my answer helps. All the very best for your future endeavors!