The GRE prep course I took with Princeton Review helped me considerably. The practice material is very comprehensive and gives one a very accurate idea of what to expect in the real exam. My instructors were also very helpful. All homework was discussed in class and doubts cleared. The online student portal, with drills on specific sections of both verbal and quant were especially helpful for me, as they gave me a lot of practice in the areas I needed to focus on. Overall, I would definitely recommend it.