Hi

Actually , seat allotment is through your rank as the problem with marks is that two or more candidates can have the same marks but  no two candidates can have the same rank , not even if both candidates have got the same marks.

This is because,
When two candidates have the same marks then tiebreaker criteria is used to provide them rank

-) the one who obtains higher in Biology gets better/lower rank
b) if there is still tie then the one who has got more marks in chemistry gets better rank .
c) if there is still tie then student with less number of incorrect answers gets better rank.
d) if the tie still persists then  the one who is older in age gets better rank.

For example,
In neet 2020 both rank 1 holder and rank 2 holder had got 720/720  marks but the rank 1 was older ,thus he got rank 1.

So, to answer your question,
If only one seat is left and both the candidates have the same marks and then the one having the lower rank will get the seat

To help you further ,some other relevant information regarding Neet 2021 is provided below :-

-) As of now ,your neet 2021 examination application form and date has not been released,  the application form is expected to be released by the end of February

-) Neet 2021 application form will be released at its official website i. e ntaneet . nic . in , and once released you will be able to fill it by going through these steps :- neet registration - > filling of the application form  - > uploading documents   - >  paying the application form taking a printout of the confirmation page . For details checkout https://medicine.careers360.com/articles/neet-application-form

-) Neet 2021 examination will be conducted twice, for details about it visit
https://news.careers360.com/neet-2021-be-conducted-twice-year-says-health-ministry

-) Internal choices will be provided in NEET examination question paper  but yes ,the syllabus of Neet 2021 is still the same. You can get the complete Neet syllabus at

https://medicine.careers360.com/articles/neet-syllabus

Now that,
limited time is left for neet 2021 , so you should be focusing on your preparation,
* practising chapterwise questions
* then revising the chapters,
* solve at least previous 10 year neet question papers as concept behind the question often gets repeated in the examination so it will be of great help in your preparation ,
* go through neet mock test papers as it will let you know your preparation level and and weak areas so that you can work on them and perform well in your examination

If you have any other doubt then you can always reach us to clear them :) we are always available to help you out and guide you

Thankyou