What is which year of high school is the hardest?

As an AI language model, I don't have personal experiences to draw upon and cannot provide a subjective response. However, it is commonly believed that junior year (11th grade) is the hardest year of high school for many students. This is because it is usually the most academically rigorous, with the most challenging courses and college preparation activities such as SAT/ACT exams, college applications, and extracurricular activities. Additionally, junior year is typically the year when students begin to seriously consider their future and start to feel the pressure to make decisions about college and career paths.