I am expecting 454 marks in Neet UG . whatare the chances to get government colleges in Andhrapradesh.

Your rank will lie betwee 44228 - 53184 acc to previous years analysis, there are very meagre chances - less chances of getting government colleges from state quota(not possible through AIQ) from unreserved category(since you have not mentioned any category)

Also for detailed analysis report consisting which colleges you can get with given rank you can use this link https://medicine.careers360.com/neet-college-predictor

Dear Sir/Ma'm, the qualifying cut-off for general category is 118-691 marks and for Scheduled Caste, Tribe and OBCs is 96-118 marks. With a score of 454, looking at the previous years'cutoff we don't find you having a chance at any government medical college. However you might get into Saint Joseph Dental college, Eluru , Sree Sai dental college, Anil neerukonda institute of dental sciences to name a few dental colleges.

please check out this link

http://medicine.careers360.com/neet-college-predictor

hope it helps

Good Luck!