Related Clues:

• Eye __
• Bit of lab work
• Mental workout
• It may include an essay
• Factor in a class grade
• Focus of a class action?
• Student's stressor
• Thing popped in school
• Word with "acid" or "field"
• It's needed to make the grade
• Classroom surprise, sometimes
• Something to study for
• Classroom surprise
• Trial match?
• Trial or examination