GRE preparation could become very challenging if you don't organize it properly, this post is to guide you through preparation plans to make it simple. Take a mock test and see where you stand initially.
Verbal Preparation guide: the main task in verbal is to get acquainted with many complex words and complete them. barron's 1000 words is the list with more frequent words, I would recommend you to download Magoosh Flashcards and do 21 Decks of flashcards. Make sure that you use those words in your everyday conversations. personally I feel completing flashcards in public places such as bus commute, waiting times... to avoid falling asleep and make use of time perfectly.
Initially complete this Material of 501 RC and 501 sentence completion after finishing this material, you will get some confidence and also learn patterns and techniques.
Then Finish Manhattan 5lbs book and this would be the right time for you to take any mock test and you can even nail the GRE test by now.
Quant Preparation Guide:
If you got a good score in the initial mock test, don't spend too much time on known topics but don't forget to master the topics which have more weightage.
If you don't have much time for preparation, finish these topics first:
Last but not least, don't compromise on sleep, have quality sleep during all these days of preparation as sleeplessness could frustrate the entire plan.