NCERT is the base for NEET. Knowing your NCERT is sufficient to cross the 300 mark as long as you have studied it thoroughly and conceptually. Mere mugging up of NCERT is not enough and understanding every line in it is important for which you may need to fleetingly refer to reference books or solve n number of questions/MCQs to strengthen your concept. 

Hello Shivani ,thanks for asking this question on this platform.actually NCERT books cover almost all the syllabus of neet exam .so if you prepare from NCERT that means you will cover all the syllabus .now for getting 300 + in biology you have to learn all the things from NCERT and still the you can also take help of any other reference book .I hope this will help you thanks 

Hi Shivani,

It cant be predict above 300  , though ncert is first preference for Neet  .but you should keep ncert books of 11 and 12th  in your finger tip ...but there are lot more books

.and also follow it as up with MTG ncert at your finger tip .

Thanks.