The associations in universities are mainly interested, supplemented by selection. Generally, the threshold is low and generous. Don't be nervous. Show the interviewer your great interest in this association. Since it is the Red Cross, it must be based on public welfare activities. You can talk more about the public welfare activities or volunteer activities you have participated in, or you can give some examples of things you care about in your life. I wish you a happy college life. If my answer can help you, please accept. Thank you!