PhD candidates have to complete minimum of 18 credits of 800/900 level courses or equivalent. These 18 credit hours are in addition to the pre-requisites specified by the PhD Evaluation Acceptance Committee (PEAC). Minimum GPA of 3.5/4.0 is required in the course work. After the successful completion of course work, the student can take the qualifying examination consisting of Part-A (written comprehensive examination) and Part-B (oral examination). In addition to the coursework, all doctoral students must register for at least 30 credits of doctoral research. PhD candidates may take any of the courses mentioned in MS course curriculum or other relevant graduate courses relevant to their area of research.
To apply click here: http://www.nust.edu.pk/Admissions/PhD-Program/Pages/default.aspx