Dear aspirant hope you are doing well...

You know which part of your syllabus is weak, so you have to spent more time and have to do more practice on it. You can also take helps for education apps for your problems. And you can also take extra classes or tution for the particular subject, so your mental ability skills will improve in less days.

Also you can read the given article link is given below to better understand and detailed information about NTSE EXAM, SYLLABUS, preparation tips, dates, eligibility criteria, important books and more..

https://school.careers360.com/exams/ntse

Do comment on comment section below. I hope it's helpful for you..

Thank you.......