The PDF contained 200 exercises, each one a tiny trap of tenses and prepositions. Lena double-clicked the file. Page one loaded.

She saved her answers, closed the laptop, and whispered to the dark room: “It’s high time I got some sleep.”

She had downloaded the file six months ago, back when “mixed conditionals” sounded like a type of fancy coffee and “inversion” was just something race car drivers did. Now, it was the only thing standing between her and a passing grade.

By exercise 102, her eyes were burning. Future perfect vs. future continuous. “By this time tomorrow, I ______ (take) the exam.” Will have taken. Correct.

And somewhere, deep in her laptop’s hard drive, the old B2 grammar PDF sat quietly, its 200 exercises finally complete—except for one tiny change. Lena had renamed the folder.

Whom. The answer was whom . “To whom the job seems ideally suited.” She corrected her mistake.

The next morning, Lena sat in the exam hall. The first question read: “Had I known the test would be this easy, I ______ (not / worry) so much.”

Exercise 1: “If I ______ (know) you were coming, I ______ (bake) a cake.”