If you're looking for a good Bible curriculum for early high school, Kingdom of God offers a solid, if not flashy, introduction to the Old testament, emphasizing the way that the OT prepared for the coming of Christ. The five parts (covering theocratic beginnings, establishment, development, decline, and transition) are divided into 48 chapters, which span from Genesis to Malachi. Each chapter of text concludes with exercises such as factual questions, thought questions, memory work, and map work.