Hi, I recently did a Bioengineering interview at Imperial so here's what to expect. For the personal interview stage, be prepared for the general interview questions (Why Imperial, Why Biomedical Engineering), brush up on your knowledge of your personal statement and refine your skills/knowledge in your subjects (Maths/Physics) as you will be asked a technical question on them. For the group activity stage, the interviewers aren't expecting you to be prepared for it and just want to see how you tackle a given problem with other interviewees. Additionally, try and be relaxed before the interview as they would be quite welcoming to you and generally want you to have a good time during the session. Wish you good luck.