After The Program
You can always access your submitted Students' evaluations by going to My Dashboard -> Student Evaluations.
You can also see your Student's (or any Student's) submitted code samples by clicking on Accepted Projects -> the Student's project. The code sample is located at the bottom of the Student's project page.
If you participated as a Mentor in Google Summer of Code in any other year and would like to access My Dashboard from a previous year, you can simply choose the program year that you want from the drop-down menu which is located just above My Dashboard.