Magoosh is one of the best company that provides test prep courses like GRE , TOEFL , SAT , GMAT etc. Magoosh’s 1 month plan for GRE coasts 79$ and 6 month premium plan coasts 99$ ( which is really cheap !! )
But, the quality of study material is super awesome !! They provide +5 score guarantee and 7 days cancel policy , which is really great. For more reviews check out. Magoosh Gre reviews.