Hello Soundarya,

In order to score a good marks in the NEET 2019 examination, you should read NCERT books of Physics, Chemistry & Biology of class 11th & 12th at least 2 or 3 times for basics, your basics should be very clear upto class 12th. After that HC Verma for Physics (part -1&2), Biology by Trueman (volume-1&2) and Pradeep Guide on Biology, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. Your study materials provided in the coaching could also be helpful. You can also read more books whose names are given in the link given below
Https://medicine.careers360.com/articles/best-books-for-neet
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.
To know more about preparation tips, syllabus, important topics, prevoius year questions with the solution, chapter wise weightage & the best books, you may visit the link given below
Https://medicine.careers360.com/articles/neet-2019
https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics
In this way you will be able to prepare yourself well and score a good marks in the NEET exam. 
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All the best.

Hi , 

As per questions are based on NCERT only. But you can't depend on that. Application lever questions would also be asked, so you can't tell whether the question is only from NCERT. It's better to be prepared.

Applying the knowledge you know is what your tuition is doing, to strengthen your base, hence don't depend everything will be from NCERT, because everything is from NCERT but it just that .you will have to apply what you know to answer the questions. So be thorough with NCERT and refer study material as refrrrefe that's it. 

Hope it helps, 

Good luck.