Hmm.... quite a bit actually. Not that I regret uni, but after 3 years Ive learnt some lessons.
Firstly I would have gone where my heart wanted to go and not my head. Academic qualifications are more inportant than where they came from. Both my choices were good Russel Grp. unis and I chose based on academic merit. I wish I had gone to the one I knew I would have enjoyed more.
Secondly I would have chosen more sociable halls.
Thirdly, join a club or society. I wish I had stuck at rugby in first year.
I would have probably taken a gap year, but im not sure. I wasnt ready then, but equally my university experaice would have benefited greatly had I take a year or 2 out, even if that was just working. I would have been much more focused and mature about my studies.
Dont turn down opportunities or make excuses. Life is much more interesting when you say yes, even if at times you wonder why your doing it. There doesnt need to be a good reason to do it, there just doesnt need to be a good reason NOT to do it.
On a similar note, you will never find cheaper or easier opportunities to do stuff you might never get the chance to do again. Take them.
Dont worry about money. If you've had a good time what more can you ask for? Getting a part time job can bring in £60 a week easily, which means that even as a student you can live a pretty good lifestyle.
Attend freshers events in both 2nd and 3rd years.
I know that makes me sound miserable, but im not. Ive loved uni, and its been fantastic, but there are still things I would change if I got the chance again.