Hello,
Don't worry in an such cases the examiner checks for the written roll number so as long as you have written it correctly , it won't be a issue.

For more updates and notifications regarding neet 2020 follow this link https://medicine.careers360.com/articles/neet

You can use careers360 college predictor to know the colleges you can get at your NEET score:- https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

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