noun
Certificate for Students Achieving the Proficiency Level of Upper Secondary School Graduates; Japanese high-school equivalency examination
Official name of Japan's high school equivalency exam, commonly called 高卒認定試験 or 高認. Passing it grants eligibility to apply for university.
高等学校卒業程度認定試験に合格すれば、大学受験資格が得られます。
If you pass the Certificate for Students Achieving the Proficiency Level of Upper Secondary School Graduates, you become eligible to apply for university.
Compound of 高等学校 (high school), 卒業 (graduation), 程度 (level/degree), 認定 (certification), and 試験 (examination). The name reflects its purpose as an equivalency test for upper secondary school graduation.