The following supplies are suggestions for AP students. Students should get supplies they will use. i.e.: don't buy a flash drive unless you are a digital artist. If you work with pastels and HATE watercolors, then don’t buy watercolors.
*The supplies that aren’t optional are pencils, erasers, and a sketchbook.
Sketchbook (multi-media will give you more medium options, 50+ pages)
Drawing/graphite pencil set
Erasers (white vinyl and kneaded are both great)
Flash drive if digital art student
tablet for digital art students
Specialty sketchbooks like bristol board, charcoal or watercolor paper
Charcoal pencils or sticks (black and white)
Watercolor set and/or watercolors pencils
Acrylic Paint set
markers (Copic, Prismacolor, etc.)
Color pencils (Prismacolors or Faber Castel polychromos are recommended)
I highly recommend purchasing a battery operated eraser. I bought mine at hobby lobby for $9.99 in the section with drafting supplies.