How can a rocky credit score be improved?

A crony of cave was in debt during most ,000 all for aged assign cards which got charged as well as payments could not be made. He assimilated Debt Counseling most a year past as well as pays them a small each month. The debt will be staid for most ,000 erst all is pronounced as well as ended in a subsequent 2-3 years. What crapper he do upon his own to begin mending his assign score? Any recommendation we crapper give him?