How to sort data from one collection into multiple sections

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I need help. So I made a website for online grading and I want to make section that displays data by subject. So Grades in Serbia are from 1 to 5 and I need help by sorting them. So all grades from all subjects are in one collection. And I want like a container box with subject name and all grades for that subject. Beacuse when you add grade it asks which grade and which subject bit keep in mind that subject selection is by drop-down and it item list is connected to subject collection. So I want subjects added to subjects collection to display grades by subject in a container box for each subject. I need help fast and I would appreciate it.