As GCSE Science students your revision guide is your bible. It contains everything you need to know for your course. The more you interact with your revision guide the more the concepts will start to sink in. At GCSE there are a lot of things you just have to know these are all found neatly and concisely explained in your Revision Guide.
Go find yours now, and search for the page that corresponds to what you are learning in Science this week.
Read that one page....
Doesn't it make a bit more sense now?
Constant revision of learning as you are learning is the key to success.