Countdown to the College Entrance Exam: My Wrong Answers Can Level Up

At the first mock exam of his final year of high school, Zhou Yan scores 412 points, ranking 638th in his grade.

He has done plenty of practice problems, yet somehow keeps making the same mistake three times in a row.

Then he gets the "Mistake Correction System": it lets him correct just one genuine mistake each day. It provides no answers, teaches no knowledge, and remains completely silent during real exams.

Zhou Yan initially thinks that correcting one problem a day will never be enough.

Later, he realizes that the dozens of points he keeps losing often come from the same bad habit.

One mistake involving a function's domain leads him to uncover seven related errors.

Seven days later, his math score rises from 62 to 118.

From 638th in his grade to the top scorer in the college entrance exam.

Zhou Yan has only one rule: never make the same mistake twice.