Keystone Schools completed the WASC (Western Association of Schools and Colleges) accreditation process in 2018 and its institutional quality was confirmed on international platforms. When the WASC accreditation process was fully completed, Keystone Schools proved that it has the same institutional standards as the world's best universities such as KIS, UCLA, California State, California Tech, UC Berkeley and Stanford, as the only private school in Turkey with international accreditation.

WASC, one of the six regional accreditation organizations authorized by the American government to evaluate and improve the educational quality of schools, colleges and universities, has been covering institutions in California, Hawaii and Pacific states since 1962. However, WASC has also begun accepting applications from some higher education institutions outside America and has been able to accept only candidate institutions that have passed a rigorous qualification process.

The accreditation process is conducted by an independent commission of experts consisting of experienced educators. In this process, it is known that a student-centered education approach is adopted in institutionalized universities and colleges in accordance with the principles of "good governance, self-development and sustainability".