Hey,

With 200 marks, you will get a rank between 444437-473780. You can check it here https://medicine.careers360.com/articles/neet-result-marks-vs-rank

Admission to  management quota seats in done ONLY  through the official counselling held under DGHS and the respective state quota counselling. For admission to Deemed Universities you need to apply through All India counselling for Deemed Universities ( held by DGHS) and for admission to private colleges other than those, you need to apply through the respective state counselling.

To get a list of colleges in which you have a chance of getting MBBS/BDS seat, you can use NEET College Predictor here https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer