Highschool Study Habits

I am a decent student lately i have been having a strong focus in my studies as I should since I’m in my first semester of my junior year in high-school. I’m not sure but I think I have a selective memory of some sort every-time I study for a test or quiz I seem to always forget the information I studied that day or the night before. I’m not sure if it’s me being lousy at my ability to study . Or I might just have a bad memory I had brain trauma when I was a baby so I’m not sure if that contributes to the problem if you know please let me know. But any help would be appreciated :slight_smile: