I registered neet application in 2021. but I signature in blue pen. any problem.
Hope you are doing well there will be no problem in your signature if there would be NTA would have told you about that so be tension free and prepare for your exams do revision and sample papers
Below is the link for sample papers for neet
https://medicine.careers360.com/articles/neet-sample-paper
Good luck
Hope it helps
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