Medicine & Health Sciences

It depends on the university in which you are planning to apply. But you need to have knowledge of your Bachelor's degree and chemistry. Sometimes, questions from chemistry do come. If you are planning for Delhi University then read your Bachelor's degree syllabus, it's more than enough. For Indraprastha University, study chemistry and Bachelor's degree portion.

Medical certificate is submitted at the time of reporting at WBJEE counselling.

https://www.shiksha.com/b-tech/resources/mhcet-college-predictor
Use the college predictor link to know about this.

Following are a few good colleges for MBA in Hospital Administration in India:
Indus Business Academy, Bangalore
MIT World Peace University, Pune
Mittal School of Business, LPU, Phagwara
Dr. D. Y. Patil University, Navi Mumbai, etc.

Yes, medical certificate is required for everyone apart from PWD certificates.

No, you cannot open a wholesale business for medicine without licence. Drug licence (DL) is required for selling medicine. First, get the license by doing pharmacy courses like D.Pharma or B.Pharma and then you need to apply for wholesale business.