As you have mentioned that you have already completed your 10+2.
Eligibility criteria for this is that your age should not be less than 17 years and not more than 25 years. You can take 3 attempts only.
Registration has already started and will continue till 1st March.
You can register yourself at its official site, i.e. , http://www.aipmt.nic.in
Admit card will be issued from 15th April, 2017 and exam will be conducted on 7th May, 2017.
Result will declared on 8th June, 2017.
You can get more information regarding this on its site.So, have a look.
All the best.