I wanted relevant work experience for my degree
I didn't know what career I wanted at the end of my studies, so wanted to gain experience
I thought it would improve my graduate prospects
I wanted to develop on-the-job skills to help the rest of my degree
Let me start by saying there is a huge difference between being at university and working in Industry. My highlight for the year would definitely be learning a lot of skills ranging from developing Project Management, to building trust with people you work with. Setting aside my ego and gradually building upon feedback by openly accepting it positively throughout the year caused a real change to my personality.
A greater awareness of which sector you want to work in
Developed technical skills
Developed professional skills
A wider professional network
Increased motivation for your studies
Awareness of the roles I do/do not want to do in the future
Experience of living somewhere different
Reflection on myself and future goals
Have zero expectations of the placement. Set up extra meetings with people you work with and ask for honest feedback if you really want to get something out of it other than money!