What am I doing wrong?

I am a university student, I study software engineering and it is my third year. This year, I decided to really focus on my studies because two years I did everything besides studying. This term, even though I go to my classes and take notes and everything; I can't get enough grades and my friends always get better grades than me. In this case, what am I doing wrong? Why do I keep getting lower grades than my friends ?

What am I doing wrong?
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