The short answer
Learn one drawing tool, one modelling tool and one rendering or documentation tool well — typically AutoCAD, SketchUp or Revit, plus a visualiser.
AutoCAD remains the common drawing standard in Indian practice, while SketchUp and Rhino are used for modelling and Revit for documentation and BIM. Rendering tools such as Enscape, Lumion or V-Ray sit on top of the model.
Employers care more about drawing clarity and coordination than about the number of tools listed. A student who can produce a clean, buildable drawing set in one tool is more employable than one who has opened six.
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