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The best thing to do is making your own notes and making sure that you understand the topics. And then, you can start doing past papers (without looking back to your notes), and see which topics in partic...

Firstly, it's really important to have a good level of familarity with the text, as this can help you choose what to write about in the exam. Make sure you have read the full text at least twice - prefera...

equation 1) x - 2y = 1equation 2) x² + y² = 13
Rearrange equation 1 to: x = 1+2ysubstitute into equation 2: (1+2y)² + y²=13expand first bracket: (1+2y)(1+2...

Equation 1) y=3x+4Equation 2) y=x+1
Rearrange equation 2 into terms of x as this is the simplest: x= y-1 (We do this by subtracting 1 off of each side to get X by itself)Substitute new equation 2 int...

Darwin's Theory suggests that all populations have variation between them, this variation is primarily caused by mutations in DNA. If an individual within a species gains...