GRE

Yes, you would have to submit your GRE scores to increase chances of acceptance for the MS in Computer Science at the CWRU. It is considered beneficial if you have a UG in a computer-related field from a recognised university,and submit documents like academic transcripts, LOR, a purpose statement, and an updated CV are also crucial to increase the chances of selection.

If the GRE is waived, you must submit academic transcripts, degree certificates, resume, statement of purpose, letters of recommendation, admission essays, and English proficiency scores. With one component waived, competition may increase, so submitting a GRE score voluntarily can still strengthen your application.

The University of California San Francisco provides a test option for GRE scores for graduate students. This means it is not necessary to submit the scores. However, some graduate programs require a GRE score just for the sake of an eligibility factor. Students can take the GRE multiple times and update their best scores to their application records. The applicant also uses their standardized test score to compensate for their academic GPA. In addition, students must make sure that they focus on other mandatory things, such as extracurricular activities, relevant experience, and more, along with aiming for high scores.

A few programs may require GRE/GMAT scores but submitting an English language score including IELTS, TOEFL or MET is mandatory. 

Cal State San Bernardino expects a minimum of 470 on the GMAT or 298 on the GRE with at least 10% on the verbal and quantitative sections. Along with this, students must have a bachelor's degree from a recognised university or equivalent and score a minimum GPA of 3 on a 4-point scale. They must submit some mandatory documents such as including academic transcripts, a statement of purpose, a current resume, one letter of recommendation, and English language requirements.

Harvard University generally does not publish specific GRE cut-off scores for its programs. Instead, they use a holistic review. However, for MS admission in Harvard, you need to score between 155 to 170 for Verbal and Quantitative, and 4.0-5.0 for Analytical Writing.

Beyond USA, GRE scores are widely accepted for graduate programs in over 90 countries. Top study destinations include Canada, United Kingdom, Australia, Germany, Singapore, France, and the Netherlands. Many universities in these countries ask for the GRE scores at the time of Master's, PhD, and MBA admissions. Always check specific university requirements.

The best GRE syllabus books are ETS Official Guide, Manhattan 5-lb Book, and Kaplan's GRE book. They cover almost everything you need. Practicing with these books can boost the prepration level.