I believe that the most useful subjects for adult life depend on the individual's interests, career goals, and personal circumstances. However, there are some general subjects that can be useful for most adults, such as:
Financial literacy: understanding how to manage money, budget, invest, and plan for retirement.
Communication skills: being able to communicate effectively with others, both verbally and in writing.
Critical thinking: developing the ability to analyze information, solve problems, and make informed decisions.
Health and wellness: learning how to take care of oneself physically, mentally, and emotionally.
Basic computer skills: knowing how to use common software programs and navigate the internet.
Time management: being able to prioritize tasks and manage one's time effectively.
Ethics and morality: understanding right from wrong and making ethical decisions.
Cultural awareness and sensitivity: being aware of and respectful towards different cultures, beliefs, and backgrounds.
Overall, the most useful subjects for adult life are those that help individuals become well-rounded, informed, and capable of navigating the world around them.