guys i looking for a good course or tutorial to learn exterior & interior modelling so can anyone recommend something for me
There is a architectural visualization course in production right now. But really any tutorial that teaches modeling is good for that, I'd say it'll get you 85% of the way. The one they have here on CG Cookie is very old, so hopefully in a short while the new will be released. If you are just starting Blender, you can watch the modeling fundamentals:
https://cgcookie.com/courses/core-fundamentals-mesh-modeling
And perhaps the course that right now more resembles building an interior is this one:
https://cgcookie.com/courses/create-realistic-industrial-environments-with-blender-and-eevee