Evidence can be made up of several things. It can be a whole class -but does not need to be a whole class.
It can be assignments from a class -as long as you can show that they support the competency.
Or work from outside the school or a job. As long as it supports the competency (and is no more than 2 years old)
See: e-portfolio-Evidence
It is up to you to select the pieces of evidence you want to use. The Student Success Planner can help you get organized