Hey I was successful in gaining a place on the SEO Corporate Programme last year (2019-2020). From what I remember, it was an hour telephone interview which started by discussing my background, University and motivation for a legal career. There was then a series of scripted questions that tested your knowledge of the workings of a law firm and law as a business. Some of the questions asked you to define what certain terms meant such as partnership and its benefits and practice areas and how these differed to departments (especially when selling services to clients). There were quite a few commercial awareness questions which picked big topical issues (such as GDPR, Brexit etc.) and asked if you knew about them and then this stemmed into a discussion of them in more detail. It is a really wholesome interview in comparison to TC interviews as it tests your commercial awareness as a whole. The best way to prepare would be to research workings of a law firm, how they operate and market themselves and then look at big commercial issue stories. Hope this helps!