I would recommend the Autodesk Certification program. It has a course curriculum for a few months and then you have to take up a series of tests to get certified in a particular field, which in your case is planning. Personally I wouldn’t recommend just sticking to planning and would ask you to improvise your skills in elevation designs and 3d interior modelling using software such as Autodesk Revit, Autodesk 3ds Max. This is because the competition is heavy and a multiple skill set gives you a added advantage and to the one that wants to employ you. Also the autodesk certification gives your resume a significant boost when you apply to firms of higher reputation and those that function abroad.