Hi Pradnya,

See the chapters that you study in NCERT for NEET preparations are a lot. 

In B.Sc. course syllabus these chapters are there but divided in the divisions for all the three years because of which you study only one to two or three chapters in depth for a semester.

But for NEET you need to cover all the chapters and that much deep knowledge is not required that is taught in your B.Sc. course. 

Hence don't rely on this idea that your B.Sc. course will also cover your NEET syllabus because chapters are there but taught over the duration of 3 complete years and not all in one year which is needed for NEET preparations.

I hope this information helps.

All the best!