Here are some preparation tips to prepare for GRE, You can follow given below:

Make your proper plan, set your time-table, you can also set your daily and weekly targets.
Work on your time management for that you can solve as many as mock test series.
To prepare for GRE Verbal Reasoning you should work on your vocabulary for that you can use flashcards. You need to practice for verbal reasoning
 For AWA section, it is better to use a pre-practiced template that covers all the crucial points. Find a template that could most aptly express your points. But this is not enough. Practice writing essays using the template.

You can also prefer the below given article for the further information.

https://studyabroad.careers360.com/articles/tips-crack-gre

Good Luck!