What subjects do I need to take for the certificate of assistant interior designer?

Design modeling, plane layout and other software to learn, including photoshop, 3dmax, AutoCAD, in which photoshop is mainly used for image processing, and PS makes shaded pictures more realistic; 3dmax is a software that every interior design must master smoothly. This software is used for modeling, materials, models and lighting display. AutoCAD is used for floor plan, and CAD software is used for drawing indoor and outdoor floor plan, construction drawing, elevation drawing and stereoscopic drawing.