I just took the GMAT for the third time and got a 650, my highest score, though all of my scores were relatively similar...

I don't know if it is worth my time to take the test again - I have aspirations to get in to a top 20 school ; and I know that this score is a poor reflection of what I am capable of - practice scores are in the 700-780 range, I just can't seem to carry those over to the actual testing enviornment.

I am a white male, 29, have a 3.43 GPA from a top tier school with a double major, I have about 6 years of very, very good work experience in advertising/marketing (5 years at what is largely considered the best company in the world, and I am currently a director at a marketing agency dealing only with fortune 100 clients...). I also think I have a pretty good reason for wanting an MBA, and great references from ivy mba grads that I have worked closely with in the past.

My question is this - I simply don't have time to take a comprehensive prep course; given the state of the world these days I had to let my entire team go, meaning that I work pretty heinous hours and have a fairly unpredictable travel schedule - I see this situation staying the same through the end of the year. Is it truly worth my time to try and take this test again knowing that 3/3 times I haven't been able to get it to truly represent my knowledge; or should I just move forward and rely on my experience/references/etc?

Any advice is helpful - Thanks so much!