GRE

There are 3 main sections in the GRE General Test. These sections include Verbal Reasoning, Quantitative Reasoning, and Analytical Writing. Each section is designed to test your general intelligence and is not at all related to your expertise in a chosen field of study. In fact, some would say that the General Test is much more relevant than the chosen field of study. Verbal Reasoning:
Conduct an analysis of a piece of discourse and derive conclusions from it. Use reasoning skills with help from insufficient data. Determine the writer or author's perspective or assumptions from reading the written content. Understand different kinds of meanings such as figurative meaning, literal meaning, and intended meaning. Identify significant points and distinguish them from less significant points. Make sense of textual structure and also summarize the given text. Understand the meanings of specific words, sentences, and whole paragraphs. Understand the connection between words and concepts/ideas. The Quantitative Test:
Interpret quantitative data or information and then analyze it. Find solutions to problems using mathematics. Implement mathematical systems such as algebra, arithmetic, data interpretation, and geometry to solve problems. A calculator is usually provided during this part of the General GRE Test. The Analytical Writing Test:
Articulate or explain ideas fluently. Support these ideas with the help of examples and reasoning skills. Analyze claims and their related evidence. Discuss coherently and with focus. Manage the various core aspects of written English. The entire purpose of the Analytical Writing Section is to help you showcase your skills in responding appropriately to a given task.

GRE is not a big selection criterion for MS programs. The selection of a candidate for MS programme is a 2 stage process:
Screening process by the admin department: This screening process goes something like, there is a list of cut-off score or threshold values for certain selection criterion. For example, all students with GRE above 310 will be cleared, or all students with CGPA above 8.0/10.0 will be selected, etc. This limit is not very strict and is flexible. TOEFL is one such criterion that will fall only and only in this screening process and not evaluated for the next one unless you are going for TA/RA, in which case they need to evaluate your English language capability (still it will be of least importance).
Some people may disagree, but this is what I personally think, seen and experienced.