Keep working on a regular basis. Never go overboard on any given day, but make sure to put something in each day you decide to visit Economics. Even if you don't feel up to it, or couldn't think of a worse way to spend your time, just do something, even if it's just read one page out of a text book. It'll mean heaps more to you in the long run than it may at the time. You won't regret it
As to what exactly to do, I'm sure you're well stocked on all the best texts available. As with most subjects, you should blend reading and dissection with questions, practice papers and anything involving actually 'doing', or applying. In other words, mix the passive with the active. This helps to build your versatility and will make you better equipped to deal with unfamiliar situations, as in the trial exam, when you'll be confronted with things you may not have seen before. What I've found to be particularly rewarding in Economics study is the outsourcing of supplementary material. What I mean by this is getting your hands on financial analyses, periodicals, newspaper clippings and anything beyond the actual syllabus texts. Although possibly not aiding in the acquisition of new knowledge, this practice will enrich your understanding of issues with which you may already be familiar, giving you additional perspectives and different angles on things. Economics, being the subjective discipline that it is, thrives on a diverse tapestry of perspectives, so don't hesitate to hoard as much supplementary material as you can find.