The GRE is a generalised test that isn’t related to any particular discipline or field. It has been designing to evaluate skills that you’ve already picked up over the years. This allows a wide range of universities to use it to benchmark applicants from diverse backgrounds applying to a big mix of degrees.
If you were to look at the overall GRE exam pattern, it has 3 sections: Analytical Writing, Verbal Reasoning and Quantitative Reasoning.
Analytical Writing This section tests your ability to analyse facts, dissect arguments, judge the presented evidence and put forth your views in the most convincing and structured manner.
Verbal Reasoning This section checks your capacity to understand the content author’s perspectives and intentions, prioritise the points made, and connect the dots across various ideas presented, even if they may not necessarily be documented in a coherent manner. This is the tricky section for non-native English speakers.
Quantitative Reasoning This is where you comfort level with numbers and quantitative data is tested. You’ll have to understand the problem and use models and mathematical formulas (from geometry, algebra, arithmentic) to solve them. The good news is that you will have access to a calculator. So no complex mental arithmetic to be done.