690 (Q39, V45) -- considering retake.

I took the GMAT 2 weeks ago, and got 690 (Q39, V45). My problem is that I am actually a mathematician of sorts, and yet scored only 57%ile on quant. My score was pushed up by a 98%ile in verbal. I don't want to insult anyone else who received a score of 690 - This can be a really good score but in my case the quant score could leave a big question mark hanging over my application (taregt schools are INSEAD, Kellogg, Michigan, Dartmouth). So, I think I might have to retake.

This was my study program last time (I knew already that quant would be lower than verbal and so I actually did not study any verbal). I began about 4 weeks before the test and studied intensively for the final 2.

--Official Guide (11th), did most problem solving and data sufficiency questions. The OG is a great book.
--GMAT Club challenges (completed only 9 becasue I discovered them with only 1 week remaining). Despite what I am saying here, I know that these are the best things out there and I very much recommend to others. I wish I had completed the whole series and then reviewed them.
--GMAT prep. Only good CATs I could find.
--Kaplan GMAT 800 - this is misleading nonsense. The questions are NOT typical of hard questions on the GMAT, in my experience.
--Kaplan CATs : again not representative of the GMAT in my opinion.

I found that the combination OG, club challenges and GMAT prep reflected what was on the GMAT pretty well. My problem on the day was one of time - I took too long on some questions and had to guess about 15 at the end. Depsite guessing those, I still thought I had a score of about 80%ile, I was shocked when it came back at 57%ile.

I would like to say something to people who have no technical background and are struggling with the GMAT. I think you should take heart from the fact that some of us with a strong technical background still struggle with the GMAT quant, which tests very particular concepts and empahises SPEED. Your background is not really important, it seems more about becoming familiar with all qustioning types so that you can do it quickly (something I did not do on the day).

I'd be very interested to hear any opinions about whether I should retake. Also, assuming I do put my self thourgh this again - any advice about more good quant materials and some new CATs would be really helpful. I'll definately be using this forum to try and both share my experiences and recieve advice from others.

Ady.