Business revision help

Everyone told me business was easy but yet here i am struggling. I take maths and computer science but this for some reason is the hardest subject. The content isn't hard, I just struggle with the massive amount of it. I still can't remember finances like grants - everything just merges into 1 even though this has been a topic i have been trying to drill into my head since summer.
Another problem is timing. I can never finish my exam. tbf i have never finished an exam but i feel like its important for business so i can get more marks. I mostly struggle with coming up with points because i can make a half decent one but then my teacher says its not in depth enough but i just don't have enough time to sit there and think for a better one