PM me your address and I´ll send you a good (2nd-hand) textbook gratis. There´s nothing better to cheer up a teacher than a student who actually wants to learn! Most students find the Microeconomics more challenging, but it´s well worth getting a good grounding in it. There´s always a question on Market Forms, so get them off pat. I´d strongly advise, though, to approach Economics from your own level of interests in resources and their use, behaviour of markets, psychology, development, the environment, global issues, national income, etc. That way, you´ll learn it far more effectively.
Edit: Better to clear it with your parents/guardians first, then PM me, and we can arrange that they contact me, so that I can send you the book.