Hello Harsh,
No u cannot carry your own Stationary.
The centre will provide you.
But yes Mask can be used.
For further clearance of your doubt, I would suggest you to go through following link
https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/neet-exam-day-guideline/amp&ved=2ahUKEwiP3pa8rrPrAhU-ILcAHT4kAUMQFjABegQIBBAB&usg=AOvVaw1sgqZ3DWujwY_XhW91xi1t&ampcf=1
All the best for your Exam and future

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