You should start your NTSE preparation with NCERT books of classes IX and X.  NCERT books contain all the concept and syllabus of NTSE exam. So, start with the basic material.

Here are some important tips you can follow:

Start your preperation with last year’s NTSE papers

Prepare for MAT Section– Student’s mental ability will be tested through the MAT section. So, it is a must to give ample time to prepare for the exam.

Strengthen Your SAT Section – Another section of the examination is SAT, to prepare for the same follow NCERT Books. Alongside, do read general knowledge books.

Solve Sample Papers– The only method to track your performance is to attempt sample papers or mock tests. Solve as many sample papers or mock tests to keep checking your progress. It also helps you in speeding up the calculations. Solve online as well as offline sample papers.

Know your Strengths & Weaknesses– It is a must for all the aspirants to know what are their strong and weak aspects. A proper and accurate preparation strategy can be formed only after that. So, know which areas are the weakest section and provide concentrate more on them while preparing for the exam.

You can go through with the given below link to check previous year papers.

NTSE Previous Year Papers

Good Luck!