Yes! Many high school students are using Biology 2 and Astronomy 2 successfully. We recommend high school students pair The Stargazer’s Notebook with Astronomy 2. And for Biology 2, if you complete the entire course including all microscope labs, it is entry high school level. Blair Lee explains exactly how to make Bio 2 a more advanced high school level in a blog article: Using RSO Biology 2 for High School Biology.
Also, many high school students are using History Odyssey Level 2 courses for high school with little to no modification. The current History Odyssey Level 3 courses (Ancients and Middle Ages) should be considered advanced high school level. American History Odyssey is standard high school level.