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DRC/CTB was a publisher of educational assessment for the early learner, K–12, and adult basic education markets. DRC/CTB was a division of Data Recognition Corporation until being fully merged into DRC's Educational Services division. From 1965 to 2015, the company was known as CTB/McGraw-Hill, a division of the McGraw-Hill companies, and prior to 1965 California Testing Bureau was an independent company.

CTB has published many assessments including California Achievement Tests, Tests of Basic Experiences, and TerraNova.