Final answer:
Essential oils can be used in the beginning or end of class to create a calming and focused atmosphere.
Step-by-step explanation:
Essential oils can be used in the beginning or end of class. They can help create a calming and focused atmosphere, and can be applied topically or diffused in the air. For example, lavender oil is known for its calming properties and can help reduce stress and anxiety, making it ideal to use at the end of a class when students may be feeling tired or overwhelmed.