Net+ Instruction, What Would Help?

Hopefully my question doesn't violate any rules, but I am looking for some feedback on areas to focus on to help Net+ students. The test is broad and the place I instruct at pretty much boot camps them. It is part of a training environment where students have to learn the material in 14 days and take the test (vouchers are bought for them). They go through A+, but many have no real experiance besides that class (they do not take the certification test though, unless they choose to pay for it). So far we have had a pretty high pass rate, but I am always looking to improve the class.

So, topics that seem to require extra focus:
Subnetting
OSI Model
Protocols
Command Lines
Port Numbers
Cabeling
WiFi

Was there any other topics that seemed to be really focused on? Ie, just the topic in general. I am not looking for specific questions on the test.

Also, from the comments, it seems like maybe classroom memory games would help?

Thank you in advance for any input.