1, official OG, official OG is an authoritative reference book produced by ETS, which contains hundreds of exercises and complete real questions.

2. The official 150 and the official 150 questions are a workbook published by sre in 20 14, with 150 questions for Chinese and mathematics respectively.

3, gre machine classics. The real questions of gre machine classics are regarded as the life-saving straw of gre test by many candidates. Brushing the real questions can not only master the rules and routines of gre official questions, but also encounter the original questions during the exam.