Hii

There has been a change in pattern of the paper since 2016 also there are a lot of updates and changes in the NCERT. AIMPT became NEET. The number of questions in the paper reduced and there has been a lot of additions to the NCERT.
So refering a book of 2015 will be helpful but will lack the new topics which have been added later So it is suggested that if you are using te books of 2015 AIPMT please add the latest reference book editions to your preparation material so that your preparations are updated and you do not find any question out of syllabus in the paper and could do well in your examination.
To know the best books, here is the list -

• Complete NEET Guide -physics, chemistry, biology from MTG Publications
• Objective physics, by DC Pandey
• Concepts of physics by HC Verma
• Physical Chemistry by OP Tondon
• ABC of chemistry class 11 & 12 by Modern
• Chemistry guide by dinesh
• Objective biology by dinesh
• Biology vol1 & 2 by truemen

Along with these, remember to go through the NCERT properly.

Hope this helps
Thanks!