Scholastic Arts and Writing Competition Guidelines for a few categories I thought you might be interested in.
Special InstructionsEach submission may consist of 1–5 poems, which will be judged as a collection. Students may submit more than one collection but must register each separately.
Science Fiction & Fantasy
Special InstructionsAll work in which science fiction/fantasy is the key element should be submitted in this category. Do not base characters or plots on already published works (books, movies, comics, etc.). Works that are novel-length should be submitted to the Novel category.
Special InstructionsShort Stories in which humor or science fiction/fantasy are key elements should be submitted in those respective categories.
Fee: $5 for single entry or $20 for a portfolio. You can apply for a wavier.