TOEFL SPEAKING TASK 5: The female student want to go to a Shakespeare's play with her friend tonight, but she has a biology exam tomorrow morning...

The female student want to attend the Shakespeare's play with her friend tonight, and they already booked the tickets. However, she has a biology examination tomorrow morning and she definitely needs to spend some time on studying tonight.
She said that she can bring the biology textbooks with her and reviews just a portion of it on the way to the theater and studies the other portion when she got home. If she could concentrate, it may be an effective way. But there is still a chance that she may not go through all parts of the exam. Another option is to cancel the arrangement with her friend and spend the whole night preparing for the exam. She said that her friend can understand her condition.
What's the woman's problem and what are the possible solutions? Which solution would you suggest her?