Permit test

These were a great help for me.

http://www.cristcdl.com/otc/

You pass those, you'll pass the test.

For the air brake valves, get a couple of shot glasses (or coins) and set them up like the schematic in the manual. When you flip the one for tractor emergency (or trailer, service, etc.), figure out which ones down the line flip, and flip those too. It'll help you visualize things.