Mastering a skill would take time, determination and practice. This goes to the same with GRE exam (instead of saying "master", using the word "prepared" would be much suitable).
If I may suggest, a minimum of 3 months should be a good time-frame to prepare for the GRE Exam. Within that 3 months, you should have studied every section of GRE.
Having a SMART objective can be great.
S - Specific: GRE Test Preparation for 3 months. The person should be able to fully prepare her/himself for the GRE Exam by taking mock/practice tests and reading every book available for GRE preparation. This way, he/she can be confident while taking the exam.
M - Measurable: A proper schedule should be created and maintained.
A - Achievable: You should see for yourself that the time allocated for each topic should be achievable. A schedule with defined time and activity is something needed for preparation.
R - Realistic: Provide each topic a realistic time to finish each one. Let’s say 3 weeks for each topic and the last 2 weeks should be reviewing everything you learn. Review can either be done by answering back all the mock test you made. (But that depends on you)
T - Time-based: Schedule, schedule, schedule.
For more help, we have asked a couple of GRE tutors and authors with the following questions. You may click on the following to see the video interview and hear them out.
What Is The Best Approach In Preparing For The GRE?
How To Avoid Cram While Preparing For GRE Exam
How To Get Used To Stress and Time Pressure? (Quantitative Section)
Helpful Tips For Anyone Interested In Taking The GRE
Are Practice Tests Harder Than The Actual Test For GMAT or GRE?
Bonus: The Best Strategies for Recall (Vocabulary Section)
