Can you be homeschooled for only one class then go to public school the rest?

Yes, this is possible, but it's not a common arrangement. It would require significant coordination between your parents, the homeschooling entity (if any is required in your state), and your local public school. The public school would need to accept the homeschooling credit for the single class and ensure it aligns with their curriculum standards. There might be paperwork involved to demonstrate the class was taught to a satisfactory level. In some areas, it may simply be too much administrative work for the school to accept.