Architecture involves a diversity of disciplines drawn from technical and artistic.

Hit the books.  Go to the library at your school and ask the librarian this same question.  Find out about the fundamentals of architecture - what topics are most needed.  Math?  Probably.  Especially geometry.  Get yourself on a path to take a course in Physics, either in high school or in college.

Design is also important.  If you can, get into a basic visual design course, do it.  Or CAD (Computer-Aided Design) and learn some tools used in basic design.

Technical skills (math, geometry) and design (visual) are both important to pursue.  But check it out in your library, too.

I found a decent resource page on the topic, listed below.