"In fact, the Department of Education does not set curriculum; states and local governments do. The Department of Education collects statistics about schools to monitor student performance and promote practices based in evidence. It provides about 10% of funding for K–12 schools through federal grants of about $19.1 billion to high-poverty schools and of $15.5 billion to help cover the cost of educating students with disabilities.
"It also oversees the $1.6 trillion federal student loan program, including setting the rules under which colleges and universities can participate. But what really upsets the radical right is that the Department of Education is in charge of prohibiting discrimination on the basis of race and sex in schools that get federal funding, a policy Congress set in 1975 with an act now known as the Individuals with Disabilities Education Act (IDEA). This was before Congress created the department."
Click on this link to understand the history and function of this much-maligned US government department.