Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poorly Done

1. I found many errors and typos in the book.2. It failed to even explain simple concepts like hexadecimal and octal conversion.3. It failed to adequately explain inner classes.4. The test engine would not install on my NT machine.5. Since the test engine failed to install, I used the engine available from the website. The questions seem to repeat.6. I consistently scored in the high 80s and low 90s (percentage) on the practice exams, but failed the official certification. Hence, I find the test engine is useful but not realistic.My summation: do not purchase this book. It helps, but it is not a one stop solution to your test preparation needs (despite its billing). I will retake the exam in 2-3 weeks, and I will find other preparation material.To Jaworski: I suggest you spend more time revising your next version.