Oxford uniQ Watch
They also have an online scheme for many students who don't get onto the week itself. The whole point of the scheme is to encourage people to apply, so I would definitely encourage you to apply for the scheme - and also remember that even if you don't get onto the scheme, you can (and, if you want to, you should) still apply to Oxford. I worked on the scheme this year helping to run it and everyone who does it finds it extremely enjoyable and beneficial, even if to affirm that they do/don't want to apply to Oxford.
Best of luck!