PSB Insights interview questions

-1 round of HR screening call -1 round of in-person interview in their office in London, need to create slides to present with case studies sent in advanced - following by panel interview with three interviewers, asking typical behavioural questions and talk around your experiences with a lot of follow-up questions

There's a lot of questions given. I have just answered it politely. They require to use the English language all throughout the interview. I have a little slang but still it went well but