You could be forgiven for thinking that vacation schemes are all about the law. This is partially true—but they can also be about the gig economy, artificial intelligence, construction strategies or international mergers. These are all topics in which legal input is vital, but they aren't exclusively legal topics.
As a result, doing a vacation scheme could give you a broad perspective on how businesses function and the concerns of organisations in the world today. So it makes sense that you should do as much research as possible into commercial matters before applying, so you can draw attention to your specific interests as well as your broader understanding of the law.