Of course this program is a summer camp where you will participate in many activities, meet a lot of people, travel and visit a new city. However, you need to know that there is a lot of work. There are assignements to do, homework, essays, presentations...
And you will be graded at the end of the summer camp for all your work. So, if you are like me and you want to make sure you get good scores, you will have to study well.
There are no "tests", more like research work (at least for the subjects I had).
That being said, you shouldn't worry a lot about it: you will still have a lot of time to enjoy and have the summer of your life.
So, on an average day, you would have registration in the morning, followed by breakfast, two-morning courses (for Broadening Horizons) separated by a break. Then, you would have a lunch break where you can go to town to grab food.
Afterward, on some days there would be an afternoon workshop, and if not, you will have some planned activities (punting, city tour, treasure hunt, check the botanical garden...) followed by registration and dinner at the campus. And at night, there would be some activities, such as TED talks, talent shows (those were some of the activities prepared when I was at the camp, but they may vary by campus/year)...
In general, I was very excited about this trip. But since it was my first time traveling alone, I couldn't neglect the fear of being far from home, from my comfort zone. I had to live for two weeks with complete strangers from different cultures.
At the end of the day, you attract people from your vibe. Once I arrived, making friends was really easy, seen that no one wants to be alone and everyone was seeking to build new friendships, and the friendly team made the whole trip smoother.