Buy good certification books. A teacher is not going to talk that much without wearing out their throat, so in the final analysis you are going to spend a lot of time reading and studying those books anyway. I was told by a training school recruiter that the recommended process was to take a class for 3 full days, then study for a month, then take the certification exam. So, that s at least ten days of study in front of a thick book for each day of class anyway. So you re going to buy and study thick books anyway.
People can and do pass the certifications simply by studying on their own.
Buy computer based CD-ROM training. It s easier to stay awake. The questions and interactivity force you to interact with the material. Using it immediately and getting immediately feedback does help reinforce learning and understanding. If you have a question you just cannot find the answer to, put it out on one of the many newsgroups or listserves on the Internet, and let experienced on the job networking professionals help you out.