i think that cramming on economics has little point to it in the way most people do it i.e. reading textbook, notes, highlighting etc.
the best way you can learn topics is by watching youtube videos - it gets me good marks. its the most time efficient way to study imo.
many of the concepts they teach you in the textbook - whole chapters - can be summed up in three minutes, you need to get past the bullshit that you know through common sense and doesn't need to be refreshed in your mind, and focus on the memory triggers, or key points, which once in your mind, will allow you to talk about them for a long time.
i can ask you what are four causes of inflation (maybe a bad example cause you know them by heart) and you might struggle initially. However, when these four causes are creatively explained in a video, it is easier to remember them as real (adjusted for inflation - no.) concepts rather than a list of reasons. When you can differentiate them easily, you will be able to answer such questions much easier.
if I were you, try and cram each chapter into a 500 word report. then, cut it down to 300 words. then down to 200 words. then down to 150. If you do this, you will fully understand the key points and be able to distinguish them from stupid information.