You may have questions raising about Compulsory credits when you compare Students records from one Grade to another. 

Here is some additional information about the subject: 

Based on the Ministry Graduation requirements, the system will assign into categories "first come first serve" in chronological order....  based on the completed course timestamp (the date it was completed), so first completed course from top to bottom (starting with English). 


Ministry webpage

So when you go into the Student records > Achievement > Graduation requirements and you set it as “Detailed”, you can see how the completed courses were assigned into categories: