A Test of Patience

Assalamu alaikum, guys. So basically, I’m a student and on the Day of Arafah, about a month ago, I fasted, prayed, and made sincere duaa to pass all my subjects, but it didn’t work out. I’m not complaining or doubting Allah’s plan, but I keep wondering why. I studied really hard, and both me and my family know that. I even managed to pass the other subject I used to fail, but math was the one. My grade average was 5 out of 10, and I needed a 6 to pass the class. My teacher could’ve either failed me, making me study all summer and take a final exam, or just pass me normally. I put in the effort, I prayed, I made duaa, but still nothing. Now I’m here telling my mother the news, and she’s heartbroken-it might seem small, but for her it’s a big deal. I just want to understand why, even though I know no one can really know what Allah has decreed. But I thought maybe someone here could offer some advice or comfort. JazakAllah khair.