Head to Reporting > Reports > Attendance (tab) > Custom Attendance Report.
Enter the dates you are wanting to report on, and under Include Years remember students have rolled up a year. So, if you wish to report on last year's Reception to Year 6 attendance, select Year 1 to Year 7, and ensure Include Former Students box is ticked.
This report will give you a breakdown of attendance by year group for the school, with total school attendance figures in the bottom row, for the past academic year. You can exclude attendance for students under 5 by entering a cut-off date in the box just under the selection tables. You will not be able to report on attendance by form group, as form data is not archived by ScholarPack.