Flunking grades is a term used to describe the act of failing a course or classes due to poor academic performance. The two crossword solutions for this term are EFS (3 letters) and EFFS (4 letters). EFS stands for 'Expected Failure Standards' and EFFS stands for 'Expected Failing Final Standards'. Both terms refer to the standards that must be met in order to pass a course or classes. These standards are usually set by the school or university and can vary depending on the institution.