Its the formula booklet right?
I had used it, what i did was, while going through it, i would make a note of things missing in it. See the things is: while i revised something from some good standard books and solved questions for revision, i would sit with formula booklet side by side, then whatever things i wanted to add to it, i added. Finally for my end revision, it really helped me. You wouldn't have to add much as it has almost everything.
How has your preparation been?? Give me a little background. If your basics are good and set then the book will help you recall and revise specially towards the end.