This is the nursing textbook 'Adult nursing, internal medicine and surgery nursing'.
The title of the book is Brunner & Suddarth's Textbook of Medical-Surgical Nursing (15th edition).
This is a specialized textbook for nursing students, covering topics such as disease mechanisms, diagnosis, treatment, and pre- and post-operative care. The photos show Volumes 1 and 2 and the study guide.
Apparently, they're going to memorize this entire thick textbook.