Dear Aradhana, AIIMS doesn't notify you of your registration status. Please follow these steps to check your Basic Registration Status:

Visit the official website aiimsexams.org 

On the home page, Click on ,'Accademic Courses' and select MBBS from the dropdown. From the 'General Links' page, go to 'Candidate Login Page'. 

Or you can access that page directly by using the link: http://ugcourses.aiimsexams.org/#!

You need to access the Applicant Login Zone. 

Login with your credentials and you can see the status of your Basic registration.