To print marksheet, go to Examination > Print MarkSheet then select the Exam Group, Exam, Session and Class, Section and MarkSheet Template and then click on Search button. The list of searched record will be shown in the below of the page.
Now select all the student generate for marksheet and click on the Generate button present at right side in the student list, at click of this button marksheet will be open.
Note: Do not print the marksheet directly, here select the Destination (save as pdf) and save pdf file and then print marksheet using this pdf file.