hey do you guys reckon that if I can write a sustained essay on each of the key concepts of the national study that I will be alright. The key features and groups can be worked into one of the key features. also knowing that there are 2 questions would it be safe for me not to study 1 key concept??? just havent got alot of time to work for it as i have 2 maths exams this week so ne help would be appreciated.