Hello!
With 10-12 mark questions, they are normally tied to stimulus, so what i would suggest this going through all the stimulus to see which stimulus you can understand and talk about and then reading the connected question and relating this back to the stimulus by making annotations, what i recommend doing is writing all of your ideas above the question so you have a clear idea on what you should mention and are able to clearly express your thoughts and understanding of the key concepts the question is trying to realte, i highly recommend with stimulus questions to USE all the stimulus as this indicates that you fully understand the question and what it is asking, for this years exam i highly expect a stimulus question that will relate to drawing relationships from high-income countries to low-income countries, so in this case before beginning to write an answer, on the side of the page write the characteristics of each country so you are able to compare them in a clear sense, with 10-12 mark questions i suggest reading them in the last minute of reading time so you can begin with it to finish it straight away and remove a lot of stress from that as if you leave it until the end and have to read the entire stimulus again, it is easier to miss something.
I hope this helps!