Hello Riya

NCERTs are the best books to clear your basic concepts but you should also refer to other books for in depth knowledge. NEET UG 2019 exam is scheduled to be conducted on May 5, 2019 and now, it is very important to study with an effective study plan during the last few days.

The last few days are crucial for revision. You should practice in such a way that exam goes smoothly. Since time is little, you should avoid starting new topics. Instead, you should revise what you have learnt, attempt many mock tests, sample papers and finally analyze each attempt.

In case of set backs like scoring low marks in the mock tests, it is crucial not to lose hope but to reanalyze and learn what needs to set it right. Make sure that you attempt mock tests exactly like you would attempt  the actual exam.  This will ensure that exam jitters go away and you will also develop time management skills as well as enough speed to complete the question paper within the given duration.

You can also enroll for the NEET Rank Booster for an effective preparation and to score good in the exam and get seat in any decent medical college

https://www.entrance360.com/neet-rank-booster/

Good Luck!

Thanks for your query. 

NCERT biology will surely help you in getting more than 300 marks out of 360 if you read it thoroughly.

Ncert physics and chemistry have to be read but for them, hc verma and dc pandey also to be read for reference. 

Numericals have to be practised from both. 

Good luck