The solutions to the Mock CCC 2015 can be found here:

Junior: https://accounts.google.com/ServiceLogin?service=wise&passive=1209600&continue=https://drive.google.com/file/d/0Bz8sftGywZGxOHBmRXhINjY5U3M/edit&followup=https://drive.google.com/file/d/0Bz8sftGywZGxOHBmRXhINjY5U3M/edit

Senior: https://accounts.google.com/ServiceLogin?service=wise&passive=1209600&continue=https://drive.google.com/file/d/0Bz8sftGywZGxSzZTMzE2NEhKb2s/edit&followup=https://drive.google.com/file/d/0Bz8sftGywZGxSzZTMzE2NEhKb2s/edit