Hi there,

To prepare for any kind of exam, the basic need the student has to fulfil is the well understanding and implimentations of a topic. Anything that you study from make sure it covers the basic syllabus of the exam that you are opting for.

Make sure the book that you are reffering to cover all the topics included in the prescribed syllabus of ntse. If this is fulfiled, all you have to do is know the concepts thoroughly.

You can also refer to this link:

https://school.careers360.com/articles/best-books-for-ntse

All the best!