Stats are a great way to develop your research. You can incorporate real-time data to support your position and highlight key points. Keep in mind that you will likely need to dig into these online tools. The data won't always be delivered on the front page.
California Department of Education
This is California's collection of data from every region, district, and school. This is only for PUBLIC schools.
U.S. Department of Education
This is an official site for U.S. Education. This is the site that collects a lot of data, but also overviews of the current state of our country's education (K-12, College)
National Center for Education Statistics (NCES)
This is the site that collects ALL of the U.S. data on the country's education data. Once you select a report, you will need to create a free account using your email address. You will be prompted once you select a report.
For specialized topics, try a Google search using student statistics + your topic and look for any sites that end with a .gov which is a government site that will be more reliable with its data (just the facts, not taking a position)
Ex: What are some stats about students in foster care?