From SchoolBase version 4.2 you can submit Forecast Grades for any external exam unit or qualification.

When doing the Subject Selection stage, there is a new forecast tickbox on the right, which appears once you have chosen a unit as 'In Use', where it has an appropriate grade set in the base data. If you tick this, you can then select forecast grades from the maintenance tab and fill in these forecast grades.

Once filled, the forecast grades can be exported and sent to the boards from the Export files tab, using the new Forecast Grades button.