From where can I buy GRE books for preparation?

Yes, for admission to the MS in Computer Science course of New Hampshire University, a GRE score is required. Along with this, the students have to submit the following-

• Transcripts of previous studies
• 3 Letters of Recommendation
• Personal statement

Check more details about MSc in CS in USA

For admission to the MSc in CS course of the Uni of Madison, GRE score is not required. But the university can consider this if the score is available. A Bachelor's degree in Computer Science or a related degree is required. Also, some programming experience is required. Other application materials

Yes, you can switch between a test center and GRE Home Edition. But you must pay the standard rescheduling fee of INR 5,000.

This change must also be completed at least 4 days before your original appointment through your ETS account.

You must reschedule your GRE at least 4 days (96 hours) before your appointment.

For a Friday test, Tuesday is final deadline. 

Missing this window results in the forfeiture of your entire fee.

Yes. Many universities now offer merit-based scholarships based on your UG GPA, research papers, and internships.

Some specific fellowships still require GRE, most modern programs focus on your overall professional and academic profile.