If you need additional assistance using AutoCAD, there are a few recommended place to try. First, try searching the Autodesk Help built into the software (upper right hand corner). This will open up the help site with thousands of results.
*Please note that the help function will not be active during the AutoCAD certification exam*
Next, you can browse the help topics on the Hitchhikers Guide to AutoCAD. This goes over the essential commands required to create 2D drawings.
Lastly, the startup menu in AutoCAD has a Learning tab that has quick videos and other resources to help with the basic functions of the program: