Medicine

No, admission to either the BSc or MSc in Diabetology programs does not require NEET. These courses are distinct from medical courses at the MBBS or MD levels.

For non-MBBS candidates interested in diabetes care, admissions are more accessible because they are typically determined by academic merit, pertinent undergraduate credentials, or institute-level entrance exams.

Yes, rotational motion is important for the NEET exam. Expect and prepare for, at least, two to three questions on rotational motion as per the latest NEET Physics syllabus for Mechanics. Questions from this chapter are clubbed into the application of principles from other areas of mechanics, such as Laws of Motion, Work, Energy, and Power, and Conservation of Momentum. 

It will be almost impossible to get government seats for BDS. But you could try to get into private or semi government colleges though. Or you could take a drop year and try again next time.