* The curriculum: Some schools or districts have more challenging science curricula than others.
* The teacher: Teachers vary in their teaching styles and the level of difficulty they build into their exams.
* The student's preparation: A student who has studied diligently throughout the year will find the exam easier than a student who hasn't.
* The student's learning style and strengths: Some students excel in science, while others find it more challenging.
In short, the difficulty is relative to the individual student and their context. Some students might find it easy, while others might find it challenging.