...
The Calculation question can be set up in a number of different ways to be marked. Two standard ways are to use the internal PHP `eval()` function or to use an external `rserve` service. Formative and progress test papers will mark Calculation questions when the student gets to the end of the assessment. Summative exams containing Calculation questions will only be marked once the current time passes the end time/date set for the paper. Calculation questions in Progressive tests are only marked when the class totals report is run. The Class Totals report will automatically determine if there are any Calculation questions that are unmarked and if so will call `/ajax/reports/mark_all_enhancedcalc.php`. When successful it will reload the current script.
...