GRE ia a common entrance exam required to apply for masters in USA and few other nations.
I would not recommend anyone going for gre coaching institutes.
I would recommend buying a 6-months premium account on https://magoosh.com
This is an e-learning website for gre wherein all the modules of Quants as well as Verbak are explained in audio - video format.
The website offers 7 week free trial account where you can check the website in and out.
The sections are divided in several chapters and each chapter has a practise test and you can also practise actual gre test.
It provides you statistics based on your solved questions and you can select customised practise tests based on chapters or difficulty level of questions.
The videos are explained along with all the shortcuts and tricks that you will require for every question and the explanation starts from very basic level. Still if you have any queries you can email your query to magoosh support mail id and they reply within 48 hours.
They have a qualified faculty and it is better to learn and prepare sitting in your bedroom in a comfrotable environment as per your mood and time in stead of a classroom mood.
Overall, it is a great website and I would suggest it to everyone.
Feel free to message me if you have any doubts and make sure to verify your KYC in order to message.