I guess you meant to type NEET UG instead of PG. So I’ll be answering keeping that in mind.
Primarily all you need are 10 books of NCERT ( 4P+4C+2B ). These are way more than sufficient for NEET UG prep as the paper is very much NCERT oriented “ NCERT ke daayre main hi banta h paper.”
The study packages provided by Aakash are just a prime source of revising the NCERT with a tad bit of extra content alongwith intext exercises apart from the MCQs at the back of the chap. That extra bit of content is helpful in case of Phys and Chem. Those portions are generally asked in the AIATS or sometimes in FTs. The same can be said with respect to Bio as well but that was a trend like about 2 years ago. Though the nature of AIATS and FTs have become more NCERT oriented it must not be of much concern.
Primarily the key is to get hold of the content of NCERT especially Bio. There are minute lines one can generally miss from the chapters , from the summary or even from portions that are present at the beginning of each unit (Para related to Scientists).