Best way to improve your accuracy

I bought this course after searching a lot and found this with highest reviews and highest improvement.After completing whole verbal online course I started my practice questions from Scholaranium. Questions are divided into different difficulty levels and it has customized quizzes so you can customize your quiz with any difficulty level of questions.
At the end of every quiz there is a dashboard showing your performance,which helped me a lot to find my mistakes and my weak areas.
It has more than enough questions to practice for Gmat and the difficulty level of questions are same as official question,so you can actually practice in a proper way.
I highly recommend this course for non natives who are about to start their preparation.