Is knowledge of the past no longer useful for us today?

Is knowledge of the past no longer useful for us today?... Well I in my opinion I think 100% of your past knowledge helps you today but not just today but forever. There is so many things you are required to remember in Elementary, middle, and high school to help you prepare for college though college knowledge helps you for your career. If we didn't remember any of our past knowledge then we wouldn't be successful at all. The past knowledge we knew as middle schoolers was multiplying and dividing is  now helping us sophomores in algebra 2 and ,geometry and so much more. We should always be prepared for what comes next in school because we don't know if we need to remember it again. If our past knowledge isn't useful then education is useless. Some subjects are not necessary to learn to one but it may be useful to several fellow classmates. Knowledge especially past knowledge needs to be cherished because no matter what something of our knowledge will help us in future or present. We just never know when we will need that past knowledge to help through something.