Just some advice (from Forum Guidelines) if you want to get answers to you questions
- one question per thread
- post the question, not a link where people have to dig around to find your question
- if you need help state what help you need. What you don't understand.
- show how far you've managed to get with the question.
As you have the mark scheme you clearly need to tell us what it is you don't understand.
Help us to help you.