Dear Debojyoti, GRE covers 3 sections. Analytical Writing, Verbal Reasoning and Quantitative Reasoning. The GRE pattern includes 6 subject tests like Biology, Chemistry, Literature in English, Mathematics, Physics and Psychology. Each subject has a different test pattern. You haven't mentioned which sample questions were you looking for. The Quantitative Reasoning section tests your comfort levels of understanding and analysing quantitative information.This section tests the basic concepts of  Mathematics, Algebra, Geometry and Data Intrepreation. Verbal Reasoning section tests your reading comprehension, sentence equivalence, text completion. In the analytical section, you are tested to understand and articulate simple and complex ideas.