School started in 1844 by an Anglican Bishop, intended for Colonial elites.
The Portuguese in 1830s attended the same school as Blacks. However, they soon became the merchant class displacing the blacks. With their wealth, they supported the school financially making the way for Portuguese to have accesss to higher education equal to colonial elites. Thereby moving ahead of Black graduates from the Church Schools. That went on for sometimes, until the Coloreds eventually started enrollment. Then students such as CBJ and Forbes would find their way.
There is a more elaborate discussion in Baksh book on Educational System in British Guiana. It was his Doctorate Thesis.
I have a copy. In my research I came accross his work at a University Library. I bought a copy.