Medicine & Health Sciences Entrance Exam

You can join government medical colleges
Free of cost.

Yes, but you have to see how many students of Same SC have given this exam with same rank or less or more this Rank.

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You can check the link of Edubull https://www.edubull.com/exams/entrance-exams/neet which will definitely help to find what you are looking for. Check once to know about it and then finalize the decision to go for it.

You have not mentioned your category. So, if I treated you as OBC, above 550 is safe. If unreserved category means above 580 to 600 is safe.

You can apply for government, private, management, and deemed for your domicile. For other states u can apply for management only. But once u joined, u can't participate further.

Based on you NEET score, the following are the options for you.
1. MGM Medical College, Navi Mumbai
2. Sri Ramachandra Institute of Higher Education and Research, Chennai
3. D. Y. Patil Medical College, Kolhapur
4. Santosh Medical College And Hospital, Ghaziabad
5. KIMS - Krishna Institute of Medical Sciences, Hyderabad.

Following are the top Medical entrance exam in India for pursuing Medical related courses:
1. NEET
2. AIIMS
3. JIPMER
4. AFMC

You missed the date of registration for 2020, try next year.

Somewhat I feel best would be to get your birth skill report card and then decide investing another year.