Answer:
Step-by-step explanation:
Jenny needs to take a short nap or sleep which will make her relax and feel refreshed before reading for the big exam the following day. Sleeping helps to relax the sympathetic nervous system which is a part of the autonomic nervous system which controls the stress; thus resting/sleeping can help reduce this stress level.
NOTE: This answer is in response to the question and hence only applies to the day before the exam.