Hello, 

With a score of 450 marks in NEET, you have a chance of admission in government colleges under State Quota for General Category.  The cut off marks for each state is different and therefore, changes every year.   Admission through AIQ requires a score of 550 and more for General Category. 

Visit the following link for more detailed information.

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cut-off/amp

Good Luck.