Need to improve from 680 to 700+, please I need advices !!

Hi,

I presented the GMAT last week and had a score of 680 (Q47,Q37). I am a bit disapointed as I expected to have 700+.
I am not confident with this score to apply for a top 20 MBA Program and I plan to represent the test in approximately 1 month. Also, I feel like I screwed up completely the Integrated Reasoning section because I had no time to prepare this part.
I was not totally confortable with the timing and had to rush for the last questions in Verbal. I am sure more practice will help me to be more confortable with the timing.

I know I can improve my Quant score to 49-50 because I usually had this score in practice tests, but for verbal I'm quite happy with 37. If I can improve verbal to 40 it would be great but in any case I don't want to have a score below 37. If I'm correct a score of Q50-V38 will be around 720-730, wich is my objective.

I heard about the Knewton course, which seems pretty well designed to improve to 50+ with refund guarantee. I have some questions which will help me confirming my decision to enroll for this course :

1) Is Knewton course good enough for 700+ and not too easy ?

2) What is the time estimate in hours to achieve the Knewton course and be eligible for the refund ? Can you please, separate each section (online course, homeworking, CAT,...) ? ( I need to prepare a schedule...)

3) Is the Integrated Reasoning section covered by Knewton ?

4) What additional materials do you suggest in parallel to Knewton ?


Of course, any others suggestions are welcome

Thanks a lot for your help !!