Yes, but you have to do it over the phone. It used to be that you could just use the Further Education discount (for colleges, 16-18 y/o) but now you have to access the site through the institute's network, just like you do for the Higher Education (university) website.
Hi, I'm 14 and I bought my iMac with educational discount. I don't think that your meant to though, I think it is just for people in university, but hey, whenever you get a chance to save a bit of cash, I say go for it!