ohhh okay, well for ecc1000 the main thing they test is on your understanding of the different scenarios of the demand/supply graph. You gotta know what the consequences and results are of demand/supply curves shifting, movt along the curves, CS/PS etc. Also elasticities are important, they often combine elasticity questions with your knowledge of demand/supply graphs. 50-60% of the midsem mc questions are on this. You gotta know a fair bit about taxes and subsidies etc as well, how they impact the demand/supply graphs and the effects of those interventions (eg, how does it effect total surplus, DWL, PS, CS etc). There are also some questions regarding definitions of key terms, eg, PPF, scarcity etc