For an easy overview there are the DK books Help your Kids With Maths and Help Your Kids with Science. Then you could move on to regular textbooks or some of the more interesting books about the subjects designed for popular reading. For example but there are tons:
https://adamspencer.com.au/buy-online/

They keep you interested and give you a different perspective on maths and science.
Then there are a lot of online courses that you can do from a variety of institutions if you want. MOOCs abound