I was just wondering, apparently it sways the assessors to like you haha

When approaching questions that asks for the interrelationships, i'd listen to Mr Beuamont, its less work and it gets the mark, instead of listing 2 points for each health and human development and sustainability and more so because it discusses the interrelationships so its important that you link.
In regards to the SHD in a global context, you'd probably be given a context to read and use examples from the passage to support your answer. But I'd tackle it by using two examples through talking about the different types of sustainability of each example (2 marks) that is appropriate to the given information and how it can be used to influence human development (2 marks) (lead productive lives, expand choices, develop full potential etc). Then use info to support my answer (2 marks) and then state whether it makes improvements on health or if it doesn't (eg. decreases global mortality rates, increases the global rate of malaria). (2 marks)
I wouldn't remeber the MDG targets, just a general background of it like like the 3rd goal is to reduce child mortality so obviously it wants to reduce U5MR, not necessarily you have to state from 2005 to 200 idk lol ... and yes it would acceptable to use the targets as purpose, as they both are the aims of the goal.