Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Whakawhiti: Ko te maatauranga a Guillaume kei roto i te Lycée Robert-Schumann i Luxembourg; Collège Alpin International Beau Soleil me Institut Le Rosey kura noho i Switzerland; me te Royal Military Academy Sandhurst, Camberley, Ingarangi. I timata ia i ana akoranga maatauranga teitei i te United Kingdom i reira i ako ai ia i te Whare Wananga o te Whare Wananga, Durham me te Whare Wananga o Brunel, i Ingarangi. I te tau 2006 ka uru ia ki te Institut Philanthropos i Fribourg, Switzerland, i reira i noho ai ia mo te tau e ako ana i te rapunga whakaaro me te tikanga tangata. I muri mai ka ako ia i nga reta me te pūtaiao tōrangapū i te Institut Albert-le-Grand i Angers, i whiwhi i tana tohu paetahi me te honore i te tau 2009. I tukuna tana tohu e Université d'Angers, na te whakaaetanga hononga i waenga i nga kura e rua.  Pātai: he aha te whare wānanga hōia o te rangatiratanga kei roto i te mātauranga o Guilaume?
Royal Military Academy Sandhurst (Te Whare Wānanga o te Rōpū Taua o Ingarangi)