Hey!
Congratulations on the vacation scheme!!
To prepare, I would focus on a few different things:
1. Understand their disputes work: make sure that you know their main practice areas (e.g. commercial litigation, arbitration, etc.) and the types of clients that they act for (or sectors, if relevant). Have a think about why disputes arise from a commercial perspective.
2. Commercial awareness: I would focus your commercial awareness preparation on considering current issues that could lead to litigation and how they impact clients. This might be regulatory changes, ESG, sanctions, etc.
3. Assessments: whilst I'm not sure how you would be assessed, for any case study or written task, make sure that you are clear, logical, and concise. Focusing on identifying the key issues and risks, and give recommendations and practical next steps that are beneficial from a client perspective. If you have to participate in a group task, show that you can argue a point calmly and respectfully, while also listening to others - emotions can run high, but it's important to try to not get 'lost' in the exercise!
I hope that helps - best of luck for the VS!!