I spent money from My account to pay application fees to a college. Some part of that money was interest money. I did not get admission to that college. Am I obligated to do any kaffara?
You must not utilize this haram money for your own benefits rather you must dispose it off by giving it to poor and needy muslims to cleanse your wealth.
Give the interest amount that you gave for fees or anything else to poor and needy muslims ASAP.