noun
exam study guide; cram book
A reference book specifically designed for exam preparation, often containing summaries, practice questions, and test-taking strategies.
来月の試験のために受験参考書を買った。
I bought an exam study guide for next month's test.
この受験参考書は過去問がたくさん載っている。
This cram book contains many past exam questions.
Compound of 受験 (taking an exam) + 参考書 (reference book).