Here are some preparation tips given below, you can prefer for GRE Preparation, The exam is easy to crack if it is Planned & followed properly.

GRE General test evaluates a Candidate's verbal, quantitative, critical thinking and analytical writing skills which are compiled in three sections- Verbal Reasoning, Quantitative Reasoning and Analytical Writing. 

GRE Subject Test measures a candidate’s knowledge in specific fields. They are: Biology, Chemistry, Literature in English, Mathematics, Physics and Psychology.

You can follow the tips:

Practice: Practice is an unending task and cannot be compensated any other alternative method. There is no shortcut to practice. You should be thorough with the GRE test pattern, rules, and format.

Mark and Review: GRE allows students to mark the question for later review. In case you have a doubt regarding any answer, You should mark the question to revisit later to review it.

No negative marking: As the GRE test does not penalise candidates for wrong answers, You should not waste time trying to solve answers which are difficult to solve. You should ideally mark them for later review. But you should go back and try answering the difficult questions. Leaving a problem will do no good.

Tracking time: Candidates may be capable of writing an incredible answer at leisure, but you do not have the leisure during the exam. So, tracking the time is very important to finish GRE exam on time. It is advisable that you should complete the test 5-10 before the scheduled end-time.

Review: You should review your answers for mistakes. While occasional mistakes may not affect the overall score, repeated typos along with spelling and grammatical errors may prove to be fatal.

Good Luck!