Official Gmail Blog: Tip: Manage several email accounts with Multiple Inboxes
if you forward all your work or college email to Gmail, you can use This new feature called " multiple Inboxes" to see your two accounts separately within the same browser
how to do it
1. turn on multiple Inboxes {MI} from this link
2.set up a filter to auto archieve all mails sent to your work or college mail address
3.customize one of your multiple Inboxes to show mail sent to your address under same link mentioned at 1.
you can use MI to keep track of email sent to your college alumni address which you can forward to GMail which one can do by use filter and auto achieve and label all these messages but MI is a replacement for these as with MI you can see all these message without being cluttered at one primary inbox