noun
Commonly used by students to refer to preparing for an exam or test.
明日は数学のテストがあるから、今夜はテスト勉強をしなければならない。
I have a math test tomorrow, so I have to study for it tonight.
More formal; 試験 is a broader term for exams, while テスト is often used for smaller quizzes or tests.
Compound of テスト (test, from English) and 勉強 (study).