Here's my logic and conclusion: they have to teach you the same thing they taught us. The book that you have for 1ZA3 and 1ZB3 does not have all the material in it: The rest of it is from Advanced Engineering Mathematics, which you use in 2nd year, and anther book that you SORT OF refer to in second year for Matlab. What they did for us (last year) was copy those sections of the books, into a custom courseware. You COULD ignore the courseware, take the risk, and buy the book that we have for second year, because you'll need it anyways... But it IS a risk, because there's no guarantees they didn't change and/or add other things.
On the other hand, you could buy the courseware and be done with it, because I can pretty much guarantee you'll need it.
the "third hand option" (yea, you have 3 hands... You're deformed... Who cares) is to not buy it and just wing the tests
Up to you!