Hello.,

If you have your NEET admit card then your roll number is present there. If you have lost your NEET admit card then you can check your registered email where you may find your admit card and make a copy of it and you can check your results.

If you don't find tha admit card then you need to seek help from the official website of NTA to regain your roll number and admit card.

Hope this helps you out. Good luck