Being unemployed and a little sick of going out, I'm getting bored of my holidays and think I should start investing some time to prepare for Commerce next year

From what I understand from the UoM Commerce booklets and website, one has to complete 5 compulsory subjects:
1. Introductory Microeconomics
2. Introductory Macroeconomics
3. Quantitative Methods
4. Organisational Behaviour (2nd year)
5. Quantitative Methods 2/Introductory Econometrics/Principles for Market Research/Managerial Decision Analysis (depending on what you major in) (2nd year)
In these subjects, are there any specific topics from Maths Methods that I should go over? What about Further topics? (I didn't do further, so if there were any I should probably go read up on them or something.) Other than borrowing an Accounting 3+4 textbook to learn the key terms (I didn't do accounting either), what else can I do to prepare? I'm thinking of doing a Management/Marketing double major, should I go borrow some books about them or something?
Just want to have a head start while I have the time, that's all
