The college entrance exam is generally considered harder than the middle school entrance exam. This is due to the complexity and depth of the material covered, as well as the higher stakes involved in college admissions.

The middle school entrance exam typically assesses students' knowledge and understanding of core subjects such as mathematics, science, and language arts. While these exams can be challenging, they are designed to be accessible to students who have completed a standard middle school curriculum. The content is relatively broad and does not delve deeply into specialized topics.

On the other hand, the college entrance exam, such as the SAT or ACT in the United States, requires students to have a more advanced understanding of the subjects. These exams cover a wider range of topics and often require students to apply their knowledge in more complex ways. For instance, the SAT includes sections on reading, writing, and mathematics, with questions that require critical thinking and problem-solving skills. The ACT, while similar in structure, also includes a science section that requires students to interpret and analyze data.

Data from the College Board, the organization that administers the SAT, supports this perspective. In 2020, the average score on the SAT was 1050 out of 1600, with a mean score of 510 in reading and 540 in mathematics. In contrast, the average score on the ACT was 21 out of 36, with a mean score of 20 in English, 20 in mathematics, 20 in reading, and 21 in science. These scores indicate that the college entrance exams are more challenging, as they require a higher level of achievement.

Furthermore, the college entrance exam is a critical step in the college admissions process. High scores can significantly impact a student's chances of being accepted into their desired college or university. This added pressure can make the college entrance exam more challenging than the middle school entrance exam, which is primarily a benchmark for academic progress.

In conclusion, the college entrance exam is generally harder than the middle school entrance exam due to the more advanced content, higher level of difficulty, and the significant impact on college admissions.