You need to look at a university that is good for the course you want to do, not just doss your way in! If you are unsure about what you want to do, take a year out (or possibly more if you need to save up) - this way you can apply when you are ready to actually go to uni and make the most of your time there. I spent half of my year out attending high school in the USA simply because I'd always fancied trying it out and there was an organisation that did it! However while there I worked out what I wanted to study and was able to apply when I got home. It is harder to apply part way through the next year as a lot of places had already been assigned but I got a place at Sunderland - not known as a good university, but it turned out to be one of the best for media studies - the programme I was in!
I may have rambled here, but I hope I got my point across. If you're really in doubt about your exam results or something like that, you could take the risk of applying through Clearing only, when you will have your results and know what you can go for and when the unis drop their entry requirements to try to fill empty places.