Hello student, central pool quota is divided into many other reservation categories and are given to those candidates who belong to a state/Union Territory which doesn't have a medical college of its own, Tibetan refugees, children of para-military personnel, etc. 

Now 450 marks in NEET, in general have a lesser chance for admission into a medical college for general category. The cut off marks were 550 and above in 2018 for general category. 

In central pool quota also, if you are eligible, the chances of admission are quite less, still it would be better to wait for the cut off list for the respective quota. 

Good luck!