Since you completed your MBBS from Amrita, Kerala, you’ll be eligible to apply for Kerala state quota as that’s where you pursued your graduation. However, because you studied till 12th in Andhra Pradesh, you may also have a claim under Andhra domicile quota if you hold valid domicile/residence proof there. For NEET PG, the state quota usually depends on either your MBBS state or your domicile certificate, so you can try for both Kerala and Andhra Pradesh quotas depending on documentation.