Gradebook

[Vkum1]

Students took an exam that I assigned them but I had to assign it to 1 student and instead of adding that 1 student in the assigned to link I accidentally assigned it to everyone (but closed it immediately). The previous gradebook I have has records of all students who took it but the new gradebook shows that exam was only taken by 1 student. I am unable to enter the grades manually for each student. Is there a way to fix this? 

[BrianLester]

Just to clarify: Did you mean " the gradebook previously showed... but now the gradebook only shows"

You may be able to use gradebook history to see the grades for other students:

https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-view-the-history-of-all-grading-changes...

The reason you cannot enter grades for other students is probably that the item is now just assigned to one student