Hmmm oxbridge applications. i went to one of their 1 day sessions when i was applying for oxford last year, but only cos it was being held at out school so we got a discount! my simply advice would be, dont waste your money with this firm, whether its £50 or £4000. I don't believe that they have any real affect on the success rates of candidates, EXCEPT if you are so lazy that you cannot be bothered to do anything for your entry (and hopefully, as your applying to oxbridge, you won't be lazy) as a current student at oxford, i would certainly advise you to completely throw yourself into your interviews for the next few weeks. life certainly is busy down here, but its a great opportunity. here are a few quick tips which i consider to be worthwhile:
1) arrange a mock interview at your school with a teacher who u think will be suitable i.e. someone who can be tough and is very knowledgeable, but not too scary!
2) keep upto date with stories realting to your degree, but don't worry about knowing everything in the world that is going on. the interviews go by sooo quickly that u will never get everything in
3) don't try to second guess questions. not once was i asked 'why oxford?', 'why PPE', 'why keble', etc etc. the whole point of these interviews is to see how you react to new things and to see how you think. it is not a test of knowledge.
4) remember that every interview is different, so don't spend all your time asking others on the day 'what were u asked?' etc
5) don't worry if u have done / will do a test. i know for a fact that i messed up part of my maths questions for PPE, but im still here aren't i, so that means that u can to.
6) enjoy yourself, and remember that where ever you go you will have a fab time and be at a top uni, whether or not it is oxbridge. just be yourself and hope that you are what they want!
there u go, some advice there, now give me £20! no seriously, im sure that if anybody has any questions, just post them here and people will reply and give u lots of advice, all for free and all from oxbridge!