Organisation for Economic Co-operation and Development (OECD) has statistical information and additional country reports. Click on Countries in the menu on top to find your country dashboard. https://www.oecd.org/
U.S. Bilateral Relations Fact Sheets (summarizes the U.S.'s relationship with other countries): https://www.state.gov/u-s-bilateral-relations-fact-sheets/
Eurydice/Eurypedia (recent descriptions of national educational systems): https://eacea.ec.europa.eu/national-policies/eurydice/national-description_en
Unesco - Institute for Statistics (searchable by country and provides tables with data about different aspects of education)
United Nations Development Programme-Human Development Report (provides an overview of Human Development Indicators, including Education, for each country. Click on Country Profiles from top menu, select your country, and go to Education): http://hdr.undp.org/en/countries
World Factbook (basic country profiles; choose your country from the dropdown menu):https://www.cia.gov/the-world-factbook/