Here are a set of links and books that might help you in school, pre-university, and university study guides. I have tried to select age and subject appropriate resources to save you trawling around the internet (always a work in progress).
I have learned two very important skills in life. Firstly, at the age of five, I was taught how to read. Secondly, 20 years later at university I was taught how to think about the things I read. It often annoyed me that I didn't quite get things first time around so I needed to adopt some better strategies.