After wasting 1 year of my life, and 1 GMAT online attempt in which I scored a 590 (Q48 V23), I joined GMATWhiz with a lot of hope. I have been associated with GMATWhiz for over 6 months now, and it has made all the difference. Their course is so well structured, and the modules are so well taught, that anyone who has no idea of Quants/Verbal can also learn and score well in this exam. The AI used is so accurate. It helps you structure your personalized course, with your own pace. The score predictor is wonderful. I haven't seen such an accurate score predictor. The quizzes and mocks are very close to the actual GMAT and the scoring system of GMATWhiz is wonderful.
They assign you to your personal mentor, who keeps a track of your overall performance and timely guides you. I was greatly benefited by the guidance of my mentor, Shreyyash sir. He pointed out all my weak areas, and gave me personal teaching sessions as well in the areas where I was struggling a lot. He also helped me setting a timeline and guided me throughout my journey. Thank you so much Shreyyash sir, I can't be thankful enough. He helped me reach 680 in just few months. I am still in contact with the whole GMATWhiz team, who are helping me to improve further.
I would recommend students to opt for GMATWhiz, which gives you what you are looking for:
1. Great course structure that can teach a newbie
2. Personalized course
3. A personal mentor who guides you throughout your GMAT journey
4. Accurate score predictor and marking scheme

For me, my weak area was verbal (as you can see in my score). I was never able to get any CR question right. And with RC I used to get scared just by reading the passage.
GMATWhiz has a well structured syllabus for Verbal. Their Critical reasoning module gives you all the frameworks which make it very easy to solve any easy/medium/hard level CR questions within 1.5 minutes. The CR module helped me a lot. I was able to see my improvement and it made me so much confident. Also the SC module is very well structure. With all the golden rules they provide you with, it will be hard making any question incorrect. And at last RC module, which is the most dreaded of all, turned out to be the easiest. With GMATWhiz RC course, you get the strategy to deal with every passage and every question.
And if you still have issues, they are always ready to give you a personal one on one session.
In short GMATWhiz makes you well equipped with all the tools you require for the actual exam.
With the verbal course I was able to improve tremendously from V23 to a V36 in less than 4 months. You just have to be patient, and trust the process. They are the gurus, and will definitely help you reach your goal.