1. Deeper and wider subject knowledge: University courses usually cover more subject areas, and each subject has its own unique theoretical system and research methods. Students need to spend more time and energy to understand and master this knowledge.

2. The ability of autonomous learning is more demanding: in high school, students' learning mainly depends on the guidance of teachers and classroom teaching. In universities, teachers are often only responsible for teaching basic concepts and methods, and students need to complete a lot of reading, research and practical tasks independently. This puts forward higher requirements for students' self-management ability and self-discipline ability

3. More competitive pressure: In college life, students have to face not only the competition from classmates, but also the competition from outstanding students from all over the country and even the world. In order to stand out from the fierce competition, students need to make more efforts.

4. Increased life pressure: After entering the university, students need to independently undertake all aspects of life, such as dealing with interpersonal relationships, arranging time and managing money. These pressures of life will make students feel exhausted.

5. Worries about the future: College students are faced with various choices and pressures such as employment, further education and love. These unknown futures make many students feel anxious and uneasy, thus affecting their study and life.

6. Changes in learning styles: The learning styles in high schools are often passive, while the learning styles in universities require students to actively explore and practice. This change may make some students feel uncomfortable, thus affecting the learning effect.

In a word, college study is more tiring than high school because students need to study in a wider range of disciplines, and at the same time they have to face greater competitive pressure, life pressure and worry about the future. Therefore, college students need to constantly improve their autonomous learning ability and psychological quality to cope with various challenges.