Hiii JYOTI :)
Hope you are doing well :)
According to previous year cut offs you should have scored atleast 380-390 to get admission in govt college under STATE QUOTA in SC category . So, this time with 300 you won't be able to get any govt.  college in UP.
I am sharing the link below so that you can check for other colleges if you want.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/neet-cut-off/amp&ved=2ahUKEwjvx6PNjZviAhWHso8KHfxDDnQQFjAEegQIAxAB&usg=AOvVaw13ncSIsRF6_r3F1MyqcLzL&ampcf=1

All the best for your future.
Hope this helps :)

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