Hi Neil and welcome to RootsChat
You may already know this but if you have access to Ancestry you can check where a road is by looking at the district description
Find the original image for Ambrose Redhouse in the 1881 census.
If you then click on the next image arrow repeatedly, it will put the road into context - after South Parade it goes into Oakfield Road, nos 43, 41, 39, 37 etc. There are also a couple of other buildings in South Parade housing a number of scholars.
Also
Next to ‘Return to Search Results’ button you will see
Gloucestershire > Clifton > District 18 > 2
Click on District 18
You should get
County Gloucestershire
Civil Parish Clifton
But if necessary you can fill these in
Scroll down to District 18, and click on
View description of enumeration district
It will show you the Enumerator’s Description
On google maps, modern South Parade Mansions Clifton includes
47, 49, 53, 55 & 61 Oakfield Road
Unfortunately, none of this answers your original question about what sort of 'school' Ambrose was attending!!
Linda