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Academic Excellence in a Christian Environment Why choose Clarendon Hall. Why choose Clarendon Hall. Clarendon Hall is a coeducational day school offering academic instruction in preschool through Grade 12 and is an institution fully accredited by COGNIA. As an accredited institution of the COGNIA network we are one of over 32000 schools and systems in more than 70 countries that are committed to continuous quality improvement through accreditation.