This book, though traditionally explored first at AS-level (at least at my school) was given to me for christmas the year before by my scout leader, who is another latin teacher (though not mine at the time). It is perfect for getting down a good deal of what one needs to know, and has saved my life - before it, I could never decline a noun! If you are the only one in your class with a copy, then you are particularly lucky, as it has a certain appeal to it that real geeks will understand - I'd know, I am one!
With regards to the actual content, it is an excellent book for quick reference, particularly for nouns, pronouns, verbs and the like - all the things that you can learn orally, e.g. Bellum, bellum bellum, belli bello bello etc.
One small thing that I ought to note, is that the language can be a bit hard to get round in the way that things are worded, but if that doesn't faze you, then you're all set!
A great book for all True Latinists - get it!