Mensa's registered office is Slate Barn, Church Lane, Caythorpe, NG32 3EL, United Kingdom. MENSA is registered around the world as a trademark/service mark of Mensa International Limited and/or affiliated national Mensa organizations.here are a large number of intelligence tests that are approved. More information on whether a test you have taken is approved, as well as information on the procedure for taking the Mensa test, can be obtained from the nearest Mensa office.