Congrats for your medical!
1.) The VO usually send to you the form/chart for you to fill your information.
2.) I have 2 daughter and both their medical forms had mistake. For my first daughter her birthplace is not correct, for my second daughter some mistake in her name. So what i did after they finished their medical i send email to my VO informing that their were mistakes in name and birthplace of my daughters, and they replied to me "thank you for the information".
3.) I think Al zahra hospital in sharjah is the best. We take our medical in a clinic in al wasl jumeirah, but it take 15 days before they submit our medical result. Our additional baby which is my second daughter, she take her medical in al zahra hospital and to our surprise they submitted it within 24 hours! But its up to you, as long as it is accredited and accessible for you then it will be fine!