Hey Mayuri.

The online basic registration for the AIIMS PG January session entrance exam started on May 6, 2019. The exam last date for closing of the basic registration date is not provided as of yet. But tentatively the last day to register will be in the Last week of August 2019, for the January Session. Hence it would be suggested to register yourself ASAP if you're interested in taking this exam. You can use the link below for more details regarding this.

https://medicine.careers360.com/articles/aiims-pg-application-form/amp

Best of luck