This topic has been covered before.
To paraphrase,
Get a part time job and start saving now. Of course that won't cover every thing so do the best you can at school and see if your grades will get you a sponsorship (when they start again).
If you parents see your determination, they may help out.
It is possible to get loans. I believe the HSBC (??) do some loans for career/qualification development.
You could wait untill you have saved the entire amount. It just depends on the job you get to earn the money (after school)
Of course there is the tried and true method of aquiring a photo of the bank manager in a compromising position. No photo? use Photoshop and a pic of a goat.