Hello student

hope you are doing well and safe. With reference to your query,  I would glad inform you that you havent mentioned the name of the college but generally in majority of the cases if they have decided the date of group discussion then they never postpon or delay just for one student , i can totally understand your problem but it will be unfair to other students , so you have to manage anyhow or appear in next year

Hope you found this answer informative. Best wishes for your future