We do not currently provide a way to copy students from a past event and import them into a new event. You can however download a spreadsheet (.csv) file of your past students and use that to enter their information.
To do this, open last year's event and follow this path, Dashboard -> People -> Manage All Students. You can select the individual student by checking the box next to their name. (You can also select all of your students by checking the box below the "Search Volunteers" field.) Then select the Action drop down and click Download Full Student List.
Please let us know if you have any further questions.
Customer support service by UserEcho