I would prefer you to keep your answers long and keep up to the point. You mostly get marks for writing long. Or else you could give quality answers with diagram and additional facts related with it. I would suggest not to mug up social science rather understand it and write it in your own words this would surely help you. Just having a rough information on the topic could also help you. And try to study only important points and at maximum avoid the rest portion.
Hope this is helpful to u.