A score of 400-420 will fetch you a rank between 109937-120258. You can check it here

With this rank you cannot get a medical seat in UP. Terna Medical College is in Maharashtra and for admission to that you need a domicile of Maharashtra. Since you said you're s resident of UP, you cannot get a domicile for Maharashtra.

You can check you chances in other colleges using NEET college predictor

With a score of 400-420, your rank might be approximately between 99914-109429 . This is an expected rank range: https://medicine.careers360.com/articles/neet-result-marks-vs-rank . Now regarding your chances at Terna Medical College, you need to apply under Management Quota of Private Medical Colleges because Terna is a Private Medical College and Private Medical Colleges do not participate in All India Counselling. So with a score of 400-420, the chances are a little less because you will need atleast 450 and above. Having said that, this is based on 2019 data and cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. For a complete list of colleges that you may have a shot at, please use our College predictor: https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer