Hi mate,
I am now a chartered Building Surveyor, which is very similar indeed.
There are fast-track routes to decrease the time it takes to get qualified. Get good advice about this, else you could find yourself wasting time early on.
My route to becoming where I am now was:
A levels
Degree (three years) in Building Surveying (for you would be QS)
Then get a job (money starts)
Two years post qualification to become Chartered.
Do the maths though, it can take five years from post - A level point, so you will need to add to that any time for HNC/ HND. IF you have any experience in the construction industry, you may be accepted straight on the degree course on the basis of your experience, this will save you doing the HNC, which will mean up to two years less spent in training.
Alternatively, explore sandwich courses, which allow you to earn a little bit of money whilst getting experience.
Hope this helps
JJ
Also check out the RICS website, which will give you some help