I do believe that the interview is competency based, so I would look for competency based interview questions and answers and replace with your experience. Use the STAR method and be sure to be brief and concise and link back to the firm e.g.
Dechert is band 1 in corporate crime and works on SFO investigations so you need analytical and organisational skills. Exercise..structure is everything!! what's the matter about? what are the challenges that the client is going to face? how the firm can help? be brief and concise!