Passing the CCNA on the first try involves some more factors: * how much experience do you have taking Prometric and Vue certification tests * how comfortable are you working with Cisco routers and switches * how many practice tests have you taken
I would love to believe that pure "street knowledge" of the equipment and technology is enough to get by, but it is not true. In a CCNA exam you will be asked questions like what category a dynamic rouing protocols would be identified with. These are book terms which would not be obvious from someone who is more equipment savy and not as book smart. Other questions would ask which protocol is better for a particular situation which seem more like a relative point of view than a factual direct question.
You should begin with your books and material - the exam guides. After learning what commands and concepts they describe, take it further. Do not just memorize the single command to save the configuration, learn the command and all of its possibilites totally, then move on to the next page. Also, stay within the book topics when fully learning a command or concept. It is a waste to read about dynamic routing and go further by reading the BGP configuaration guide while studying for the CCNA. Just take something like a mention of "show run" and learn what you can really do with a "show run" command. Through this you will fully understand the concepts that the CCNA guide and CCNA exam covers, not just memorizing a single answer for a single question and then failing when the question is worded slightly differently. This also allows you to confidently eliminate wrong multiple choice answers which can be very important when confused and doubting yourself during the test.
After learning what you think you need to know, take practice exams, either paper versions or computer based tests. This will train you to what kinds of questions you will get. After doing poorly initially, return to your books to build up on the sections that you did not know as well. If you really do fail on your first attempt, this method will assure that you can see which section on the real CCNA you did poorly in and be able to return and supplement your original success with the remaining knowledge.
Good luck, and do not lie to yourself. When you honestly test yourself before the exam and see that you are comfortable with the knowledge, you will know that your test fee will return something for your monetary investment.