Question 1 is an inference question that should take you 10 minutes maximum and it will be out of 6 marks. It will ask you what you can learn from a particular source. You will have to make three supported inferences from one given source. This would mean that you make a point, then give evidence of it from the source, then move on. Since the question starts as "What can you learn from Source A/B/C...", it is a good idea to make your answer start with "From the source we can learn that..."
Question 2 is a purpose question that should take you 12 minutes maximum and it will be out of 8 marks. The question asks about the purpose of a particular source. To answer this, you should write two paragraphs. The first one should explain the message of the source and the second one should explain the purpose. Throughout your answer, use quotes from the sources and your own contextual knowledge (important). In the second paragraph (purpose one) include the reliability of the source, explaining the content, origin and nature of the source, (and also the purpose, but you should have already done that in this paragraph).
Question 3 will give three sources and ask you to consider the extent to which they agree on something. It should take you a maximum of 12 minutes and will be out of 10 marks. For this question, you need to explain the similarities and differences of all three sources (with evidence). You will need to cross reference sources for your points. Structure your paragraphs in terms of your points, not sources. (do dont include)