Hello student the entrance examination of AIIMS pg conduct twice a year for January and July session. Eligibility criteria says - Candidates must complete their mandatory rotational internship on or before 31st July 2020. So on the basis of eligibility criteria you're not eligible this year.

For more updates refer to the link mentioned below - https://www.google.com/amp/s/medicine.careers360.com/articles/aiims-pg-eligibility-criteria/amp

Feel free to comment if you have any doubt

Good luck