Dear Himanshu

Basically,  some models from NCERT had repeated Elsie's in 2017 that's why all are saying that prepare from NCERT books.  So if you comes NCERT and previous year papers, you might get 300 above because it's like the chances.  We can't assure.
Listen friend, 650+ is not at all easy to score. The only thing required is smart work instead of hard work as you have less time. Following smart work is required in the subjects:-

Biology-To get 650+ Biology is very essential. Try to score 340+.Around 310 can be scored by just learning NCERT thoroughly and revising it repeatedly.Go for Aakash study material, learn it by heart to get 40 marks extra. Don't focus much on biology throughout the year, just revise nicely in the last month's.I scored 327.Allen's module have a lot of information which even do not come in exams and you won't be able to retain it for longer.
Physics-It is the most important and rank deciding subject. Practice differenttypesof questions instead of wasting time on doing many questions of the same type. Practicing only solved examples of Cengage Physics book are more than sufficient for AIIMS too. So, by this you'll score 160+.
Chemistry-Work more on concepts ofOrganic chemistry.Go for Shri Balaji Publications book or Allen's module but not Aakash package.However NCERT is more than sufficient forInorganic chemistry, go for Shri Balaji Publications book forChemical Bonding only as less time is remaining.Practice questions forPhysical chemistry from Narendra Awasthi's book only if have time.
All the best.

To score good marks in NEET it is important to start your prepartion by NCERT books followed by other refernce books for practice. 

 

NCERT books is important to build your concepts strong. You can also get direct questions from NCERT books. 70% to 75% questions are from NCERT books. 

 

You need to refer other books for your practice. 

Below are the recommended books

 

Biology: Objective Biology by Dinesh and Trueman’s Objective Biology

 

Physics:Physics for Medical Entrance Examinations by D.C Pandey (Arihant Publications)

 

Chemistry:Objective Chemistry (Volume 1 and 2) by Arihant publications

 

It is recommended that you should solve previous year paper to understand the exam pattern and level of the questions.

 

Focus on the topics which carries more weightage in the exam. Solve as much as MCQs for your practice.

 

Good Luck!!

 

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