Hi Parul,

 As you are already aware MEM is a multidisciplinary program. Each university has its own requirement regarding the application process.The website informs that work ex is not necessary to apply for the program.

Dartmouth's 2016 batch had an average score of:

• GRE-Q — 164
• GRE-V — 158
• GRE-A — 4.0
• TOEFL — 110
• GPA — 3.5

Duke has no minimum GRE  requirement. but the previous class has an average of 

• Average Age: 24
• Entering with Work Experience: 56% (average 2.5 years)
• Women: 38%

• GRE Verbal: 151-157
• GRE Quantitative: 161-167
• GRE Analytical Writing: 3.0-4.0
• TOEFL: 102-111
• Grade Point Average: 3.3-3.8

You do have to send in letters of recommendation, Resume and SOP.

Please read https://studyabroad.careers360.com/articles/gre-scores-for-engineering-management to know more about the eligibility requirements.