Is online coaching sufficient for GRE or will I have to join an offline coaching in order to score good marks in GRE?

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

GMAT/GRE scores are not a compulsion for MBA courses at Dublin City University. Though they can be added to strengthen the application along with the updated Resume, Bachelor Degree, work experience, English language tests, statement of purpose and recommendation letter.

Beginners should focus heavily on high-weight math topics like Number Systems, Averages, Percentages, and Ratios.

These core concepts appear much more frequently. Practicing on questions related to these topics will help you.

Beginners need 2 to 3 months for GRE preparation. You should have a proper study plan, regular practice, and consistent revision.

The exam is new for you, but the core syllabus is not new for you. All you need to brush up on your learning is well.