Hi there
For a score of 600 and 650 we would guarantee a score of 650 and 680 respectively. The guarantee gets smaller of course as the scores get higher. It would be impossible, for example, to guarantee 100 points for someone who got a 680 !

I would love to but if everyone were able to achieve a 700, there would be no GMAT!
The reason for this is straightforward, as you can imagine. An instructor who guarantees a 720 would have to know that the student is starting at a 690 or so because the margin for error decreases dramatically. Anyone who blindly offers a 720 or 700 even is not being honest or does not know how scoring on the GMAT works. And promising free courses if a student does not make a jump from say 450 to 700 well, let's just say I have talked to many who have taken a same course multiple times and this is counterproductive. At one point something NEEDS to change in approach and usually that can be achieved via a smart curriculum and personal help. Moreover, our guarantees are based on the official GMAT as we do not want to fool anyone into thinking they are weaker or stronger than they really are via initial exams that are meant to convey a certain score.
That said we have helped people achieve everything from modest jumps to great jumps including strong students starting at 680 and getting 770s and 550s to 700, so the material is there to get to the highest levels. Our program is a fantastic tool and if the student uses it properly, he or she has that much better a chance to make great leaps. I am quite sure that trying the program during the free trial will clarify what our program is about and how interactive and intelligent it can be,
If you do sign up for the trial, let me know under which name and username so that I can track you and offer some guidance on your performance.
All the best,