1. All completed work must be "compositions" rather than "studies."
A composition recognizes the whole space. Compositions include drawing of more than a single form in the whole space.

In a composition; objects are seen in an environment.

Studies are practice drawings which which are done for skill building or to help develope part of an idea. Studies are not always whole compositions.

2. If more than a single work is assigned; your grade will reflect doing less than the assigned amount. Grades will reflect both quality and completeness:
One grade for the completeness and a grade for the quality of the work.