Oh well you have time and look, you are are almost half way there! I would try your school's art department. I'm not sure how it works there, but in the US (at least my area) we have photography and art classes that can help build a portfolio for college.
actually one of my best friends took a class, ended up teaching photography to herself, and also got a photography internship at a local company her senior year! Definitely if you get buddy buddy with your art teachers/division heads, you should be able to use their resources to build a wonderful portfolio