Cut throat is going to be what you want to avoid. Oxford really likes leaders and collaborators not competitors. Honestly, the biggest thing you can do is be yourself and show a real interest in the school. The admissions counselors are looking to get to know you as a person, not as a prepared script, and to find people who would fit into Oxford as a community. Ask your hosting student a lot of questions and try to figure out how you fit into the community, maybe look up some clubs and organizations you might want to join. Enjoy yourself and try to have fun not stress over the interview portions. A lot of what you do will be group work not one-on-one, but just be honest when your talking solo to an admission counselor, I promise they are all nice people and aren’t trying to screw you over.