Exam Hell
Examination Hell
noun
An "examination hell" is the nickname given to the exams you have to take in Japan all at once. That's why this is exam hell.
This is a jukugo word that smooshes two previous vocabulary words together into a new one. You should be able to read this on your own.
試験地獄に苦しむ日本の学生にとっては、電車で勉強するのは当たり前のことです。
Studying on the train is common for Japanese students who suffer from exam hell.