Warren Sapp -- Tackles Debt School Duty ... GRADUATES!

Broke NFL legend Warren Sapp just pulled a Garey Busey and officially graduated from debt school!!!!!!

TMZ broke the story ... the Superbowl champ filed for chapter 7 bankruptcy in April -- claiming he was over $6.7 million in debt to creditors -- but as part of the deal he was ordered by a court to complete a financial management course to learn how to better handle his dough.

Looks like Sapp owned that course ... he just received his "Certificate of Debtor Education" on June 19, 2012 from a company that offered the class online called Credit Card Management Services ... officially putting the former NFL star on the path to financial recovery.