Whilst keeping up with current affairs is something you should be doing if you are genuinely interested in economics, it won't really help you at AS level, AS level is more about the principles of economics and understanding the basic theory surrounding it. Try and build up a general understanding of simple models, such as the supply and demand curve, market failure, aggregate demand/supply, if you understand these basic models, AS economics is a breeze. I know people that know a lot about 'current affairs' well, everything about current affairs really, but failed AS economics, whilst i never watch the news and am expecting an A, its ended up being my easiest subject and i'm hoping to take it into university, its such an interesting subject once you understand the basics and can start looking into economics further. Most people find it extremely hard, but i think that's because they don't understand the basics, it's honestly all about the basic models, everything stems from that.