An architect these days learn to draw (most of the time in AutoCad). These are technical drawings. This is not the kind you do as a kid in school. For visualisation of the future house/ office, 3D computer drawing is learned. Models are also made with balsa wood and kartboard.
In general they learn some Statica (physica) to understand the measures all elements need to have. Sometimes a finite element model is used to calculate the strength of the building. Allthough this is for the more exotic building which you and i probably dont live in. (Most of the time a building engineer calculates the architects design)