When you say lab books, do you mean the simulators only?
To get my CCNA, I purchased the
Cisco CCNA Simulator Edition. It includes the ICND1 and 2 books, and a Java-based network sim that you install on the computer.
The books cover all topics as pertinent for the course and the answers are found in the answer appendix at the end, the simulator gives you the answers on each lab at the bottom of the PDF it opens when you start a lab. The simulator also has a "Grade Lab" button that tells you what commands you missed, if any, and if you entered more commands than the lab required to finish it successfully.
The CDs that come with the books include a Boson test environment installer and license. You want to install this on your computer to take practice exams. It's a helpful way to keep the lessons fresh in your mind and gets you used to the test interface that Cisco uses in the real exam.