Hello Skyline, I'm currently doing 3/4 accounting. I came into Unit 2 accounting without doing Unit 1 and you definitely have to pick up a lot of information. I used the Cambridge textbook and my teacher set out Chapters 1,2,5,6 over the holidays although I no longer have it with me so I can't go and check what those chapters cover. Maybe you can aim to go through a chapter a day on the holidays. You'll need to learn the Accounting Principles and Qualitative Characteristics as well as definitions and classifications of Assets, Liabilities, Owners Equity, Revenues and Expenses.
The Accounting equation is very important as well. (Assets = Liabilities + Owners Equity). Its basically the idea that every transaction will affect at least two accounts and Assets will always equal the total of Liabilities and Owners Equity. Also know the stages of the accounting process. Transactions will occur and source documents collected. These will be recorded into the journals and stock cards (Ledgers will occur in 3/4). The information in the journals will be reported into the Balance Sheet, Income Statement and Cash Flow Statement and then, advice can be given to the business.
With the reports, they don't teach the Cash Flow Statement until Unit 2 but you'll definitely need to know the Balance Sheet and Income Statement. The Balance Sheet contains all the Assets, Liabilities and Equities for the Business while the Income Statement contains the revenues and expenses in order to determine net profit. The theory behind all this is very important as well (We have Balance Sheets and Income Statements but why? And how does taking the time to prepare all these help the business?)
As always, ask your teacher and they'll be more than happy to help. There's a few helpful guides and tips on this forum for you to browse and everyone here will be able to answer your questions. It's definitely a worthwhile subject to take if you are willing to persist and take the time to do well.