With 647 marks and considering you belong to the EWS category, the likelihood of securing a seat in an AIIMS college for the 2024 session depends on several factors, including the cut-off scores and seat availability in the respective AIIMS institutions. Historically, AIIMS cut-off scores for the EWS category have been competitive, with the cut-off generally ranging from approximately 600 to 650 marks, varying by year and institution.

Given your score of 647, you are within the competitive range for some of the AIIMS campuses, but it is essential to note that the exact cut-off can fluctuate based on the overall performance of candidates in the entrance exam and the specific requirements of each campus. AIIMS Delhi, being the premier institution, typically has higher cut-offs compared to other AIIMS campuses.

To improve your chances, ensure that you meet all the eligibility criteria and stay updated on the admission process and cut-off trends for the 2024 session. Additionally, consider applying to other reputable medical colleges as backups. For the most accurate information, consult the official AIIMS admissions website and monitor updates regarding cut-offs and seat allocations.