Not sure about your background but for GMAT Quantitative, I had to unlearn some of my old techniques of seeing every question through equations and numbers to the hundredths. There is more about visualization and approximation involved in GMAT Quantitative. I was struck at V42/43 in my first two attempts because of my old techniques. Once I unlearnt some of those hard core quantitative stuff and started seeing alternatives my score improved and got Q48 (not great
but OK) in my 3rd attempt.
If you have quantitative background, just follow responses, questions and articles posted by GMAT Club angels aka Bunuel and Karishma from Veritas
KUDOS is a way to say Thank You