I generally think there is nothing wrong with using answers you formulated in your applications as well, although for some reason it seems many people initially assume that this is the case. Of course you can and should polish and tailor the answers for the purposes of the interview, perhaps by adding deeper insights and changing the phrasing for a more suitable one. However
, I do not think any interviewers have an expectation for your answers to differ much in substance from your answers in the application form. In fact, it would be more concerning if your answers were radically different, as it would show either dishonesty or an instability in your fundamental motivations.
Regarding on your question as to how to prepare, I think mostly the same as you would for a normal competency interview:
- Build up the most extended and comprehensive question bank you can and find ideas to answer those question;
- Practice by recording yourself and then reviewing your performance;
- Do mock interview;
- Deepen your research into the firm and brush up on your commercial awareness.
On the last point
, I think your research should be as extensive as it can be and I would definitely take at least half a day for it. Among the aspects that you should know, I would list the following:
- Basic firm facts: number of offices, financial figures, firm history
- Practice area/sector strengths and the firm's market position compared to competitors
- Recent big deals cases
- Recent awards and other forms of market recognition
- A few core clients
- Firm's business strategy and any recent developments (new offices, lateral hires etc)
- Training philosophy and details of the offering