It was instructed that the thumb impression on the Neet 2020 Admit Card, must be properly visible and not smudged. Now you have given the thumb impression twice but if it is not smudged and properly understandable then it won't create much problem. But to be on safe side and to avoid any hassle during the examination, you can download the admit card again and fill it up again. But if the thumb impressions are clear and not intersecting each other and not smudged then it's quite okay. You can go forward with this. Also maintain the proper dress code and carry all the necessary documents, sanitizer, transparent water bottle and cover your nose and mouth with mask and wear hand gloves. Go through our article for once http://medicine.careers360.com/articles/neet-2020-admit-card-photo-and-signature-specifications