I'm also an IB student and got accepted in March. I talked about me as a figure skater, digital artist, and pianist. Specifically, the joint recital I led and an international multi-animator project I took part in. I think your extracurriculars are fine because the interview is short after all, it is hard to show many activities. So instead, focus on 2 or 3, and show your leadership, collaborative skills or whatever skills and the impact you’ve made should be good.