Dean of INSEAD's Asia campus, Hellmut Schutte, says demand is also being driven by the fact that many business leaders do not have an MBA degree and are keen to improve their skill levels.

CNN: Economic growth underpins demand

Even if you already have a designation, employers expect workers to consistently improve their current skill sets.

CNN: Does your resume need new acronyms?

By turn, applicants take the WorkKeys assessment to measure their skill level and identify ways to improve, through online training, the skills that employers seek.

FORBES: The Qualified Job Applicant, Redefined