CS insight day advice

I'm a first year Uni student and I'm doing CS that includes a year in industry. I've heard that year in industry gives enough experience and benefits that it's worth doing it for a whole year so I applied for that one (4 years in total).

I'm just aiming to study as hard as possible and just get as much experience as possible. I've had a look at a couple of 1 /2 day insight programmes for good companys (that later can lead to summer internship/spring internships) however they all say that the only students eligible are students in their 1st year of a 3 course or in 2nd of their 4th year course.

Can someone explain to me why this is and how to get around it for such experience? On top of that, I'm not even completely set on the year in industry, so would it be a silly desicion to transfer to a 3 year course, applying to these insight days and then in 2nd year deciding if I want to do the year in industry?

I would appreciate any advice!