You should have a packet of white charcoal/pastel paper. For this assignment, I'd like for you to focus on drawing all kinds of different tree drawings that you make from looking at trees. DO NOT JUST MAKE THEM UP. The AP graders want to see that you are drawing from observation. Fill your entire booklet with tree drawings using any kind of drawing medium you can think of. Use pens, pencils, charcoal, ball point pens. Try using water with your charcoal pencils, try smudging it with a Q-tip, try hatching, cross hatching, etc.
Use different kinds of compositions, triangular composition, rule of the 3rds, zig-zag. You want to spend a lot of time on this project and try to get at least 1 or 2 Breadth pieces for the fall.