The official website ICSI released a notification that all students who have registered for CS Foundation have to undergo a mandatory 1 day Orientation programme to enroll for the CS Examinations. ou can check that notification at: https://www.icsi.edu/media/webmodules/16052019.pdf . And the students need to complete the course with 15 days from the date of registration. So if you want to write CS Foundation examinations, you have to attend the Orientation programme without fail and there can be no 2 ways about it.