How do you use this book? This book can be best utilized if you follow the steps described below:

Step 1: Identify what type of problem it is according to the method used in this book. In the diagnostic test of this book, the question numbers represent the category identification number of the problems you want to train yourself on. These numbers are cross-referenced to the corresponding section in the book.

Step 2: Do the sample questions of the section, in which you would like to strengthen your skill, without looking at the instruction. Through this, you will be able to identify your weakness in handling this type of problem.

Step 3: Study the answers and approaches to these sample questions, which are available after the general instruction.

Step 4: Read and become familiar with the general rules and content of the instructions in the shaded box.

Step 5: Try the Practice Questions following the sample approaches and answers.

Step 6: Contrast your approaches with what is demonstrated visually in the answer section in the back. You may find yourself performing many unnecessary calculations. But, you can train yourself to find the ways, as demonstrated, to answer them more efficiently.If you do the diagnostic test on the following page or do any mathematics section of practice test sets in SAT/GRE/GMAT books containing actual problems and find that a problem is difficult to solve...