Take a break from studying, get your mind off gmat, recharge your batteries and come back with vengeance
you do have to change your study habits a bit, if you keep studying the same way even after 4 months the result may not change, and changing old study habits are not easy, so be prepared to come out of your comfort zone.
having said that, you did not mention the study materiauls you used, so if you haven't already get the MGMT series (all 8 guides), OG guide 12 ed or 11th ed, and OG verbal
if you order them online and it takes a week to arrive go to the local library they might have old versions.
keep an error log
, not a fancy one on excel or something just jot down Q # you got wrong and make sure you go over it, don't go to the next question until you have understood why you got the last one wrong.
You said you are not comfortable with number properties, I swear when I started studying for gmat I spent a week learning fractions/percents! and it was frustrating because I realized I had forgotten LCM/GCF
and boy I felt silly starting from grade 5 math qs! but I knew I can't climb a ladder by skipping steps.
if you really want to go to Quant basics here is a great website : http://www.khanacademy.org/
the guy is amazing had solved the entire OG 11th ed, and has great video lectures/exercises.
hope this helps,
keep us posted, I am sure one day we will all read a great debrief about your 700+ score!