CS6 will be the last owner owned PhotoShop software from Adobe.
As a student, you are eliglble for a student discount thru Adobe. I would purchase the Disk or download the free 30 day trial ver. and make the Adobe purchase thru your school.
I notice that when I package stuff I’ve done in computer school studio sessions and store it on my external hard drive to take home and do further work on it that I frequently get messages that my Adobe CS6 InDesign, for example, cannot open the file because it was done in a more current version of ID. I can really only open files I’ve saved as PDFs. So it might be worth it just to be on an even basis with the CC version I’m using in computer graphics classes.