taking a graduate school entrance exam
Refers to the act of sitting for or preparing for graduate school entrance examinations. Often used in contexts of exam preparation or the exam period itself.
I study every day for the graduate school entrance exam.
Preparing for graduate school entrance exams is tough.
Refers to undergraduate university entrance exams, while 大学院受験 is specifically for graduate school.
Abbreviation for 大学院入試, commonly used among students. 大学院受験 is more formal and less colloquial.
Compound of 大学院 (graduate school) and 受験 (taking an examination).