시험이

exam

→ 시험
phrase Rare #32,373
exam 이 is the subject particle used after nouns ending in a consonant; it often has no direct English equivalent.
KO: 시험이 내일 있어요.
EN: The exam is tomorrow.

시험이 어제 였어?

Was the exam yesterday?

— 스즈메의 문단속 (2022)