GRE - Preparation Tips ,Tricks ,Cracks ,Dos & Don's ?

Gre Quantitative section requires a lot of practice and you should solve questions by keeping a time limit each time to be completely ready for the test day. There is no need to freak out. A good amount of study every day will definitely fetch you 315 +.
For remembering GRE words the best way, in my opinion, is to group words together that have a similar meaning. Through this approach, it becomes easier to remember a bunch of words in one go.

You can do this manually or use an app that has it done already.

There's an Android App called Tweak GRE Flashcards: https://play.google.com/store/apps/details?id=com.tweakgreflashcards

It has the 1000 most frequent GRE words arranged in clusters based on their common meaning. It's free and has no ads.