hello sir,what study material or books should i refer to score good marks in ntse .thakyouaditi

Hi Aditi
To crack NTSE, prepare NCERT syllabus of class IX and NCERT syllabus of Class X.
You can find the syllabus on the following url:
http://www.askiitians.com/ntse/ntse-pattern-syllabus.html
Apart from this you can buy any book for preparing for MAT (mathematical ability test). Make sure you find both verbal and non verbal tests in the book.
All the best!