Dear Student.
You have to download the Business Rules file from JoSAA 2019 official website and search for a certain annexure which contains the entire required format for the Medical Certificate. Take a printout and fill all the details correctly and carefully and get it signed by the doctor as well. Click this link to know in detail about JoSAA Counselling 2019: https://engineering.careers360.com/articles/josaa-counselling .
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