NEET 2021 will be conducted with a reduced and revised syllabus and we do not know what topics might be deleted or what topics might be retained. But CBSE has revised its syllabus for Class 11 and 12 and so sticking to those topics might help you in your NEET preparation because NEET syllabus is loosely based on Academic syllabus.  If you are preparing for NEET from home, you can try our NEET Knockout package: https://learn.careers360.com/knockout-neet-may/ . So until MHRD or NTA announce the official NEET 2021 syllabus, sticking to NCERT is the best strategy.