How do I approach the 8-10 mark questions on a paper?

Firstly, don't panic! These questions are always either a description of a process (so you can learn it off by heart), or an analysis of information that is given to you. Although it's not advisable to write in bullet point, it often helps to break up your answer in a similar way in your head. Then it's easier to have a logical order to your answer. If it's a description of a process, then this is just the order of events. If you're analysing information you haven't seen before, just make sure you've finished explaining one point before you move on to the next. Try to make comparisons between sets of data. The number of marks is usually the same as the number of points the examiner wants you to make, but if you can think of one or two extra, AND IF YOU HAVE TIME TO MAKE THEM, put them in! They act as a bit of insurance if you're unsure about a point you made earlier in your answer. Because these questions are worth so much, it's often best to send more time on these and get them right, than stressing about any 1 or 2 mark questions that you can't answer.