Does Oklahoma University require GRE?

No. The dMAT is just an APS verification requirement for Germany. It does not replace the GRE. If your target German university explicitly asks for a GRE score for admission eligibility, you must still take it.

Yes, GRE is still required as dMAT has not replaced it. dMAT is an aptitude test required for the APS documentation process, and GRE is a university admissions test. Both these exams differ in their purpose and the courses/documents they're used for.
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Yes, GMAT/GRE scores are important for getting into MBA Course at LMU Munich. The minimum scores for GMAT/GRE is approximately 565. Along with this, there are some other selection criteria that includes:

•            UG Degree with 60-65%

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No, GRE/GMAT scores are not a compulsory entry requirement for MS Course at University College Dublin but it could be added to strengthen the application. UCD only offers 1 MS Course to Indian students that is MS in Economics and Data Analytics. The compulsory entry requirements are-

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A GRE score is recommended (not mandatory) for admission to MS in CS course of Michigan State University. For the recent admitted class of MS in CS of MSU, the following were the stats of the students-

• Quantitative: 164
• Verbal: 153
• Analytical Writing: 3.0