Hey I understand what you're going through. I gave my first GMAT in Aug 2014 and scored a mere 630.
I got disheartened and started focusing on my work, instead of giving the GMAT again.
A year later, during Sept of 2015, I realized it was that time of the year again. I had to do something with my life and had to score well in the GMAT.
I mocked up a 30 day plan. No matter how much research you do and how many articles you read, you always do it on your own. So you have to make a plan. I'll tell you what worked for me:
P.S: This is only for guys who find it difficult to score, who are not naturally inclined to critical thinking and who are ready to slog for 30 days.
1. Book the exam a month before the start of your preparation.
2. If you're working, take a leave of 30 days.
3. Prepare yourself for a tough month.
4. Buy 10 Kaplan, 10 Manhattan, and 2+2 Official GMATPrep tests.
Also, buy the Kaplan book and the 3 OGs.
5. Finish the Kaplan book in 2 days. Remember your mistakes. Remember the SC rules.
6. Start taking one test everyday on the exact time your GMAT is scheduled. Keep 2 GMATPreps for the last 2 days.
7. You'll start scoring in the late 500s or early 600s. After the test, analyze each and every question. Analysis will take 1-3 hrs. Try to figure out what the examiner wants from you.
Critical thinking and sentence correction were my weak areas. I used to get the average level and hard level questions wrong. I didn't know what to do. I later realized how to 'think' and how to use the information given in the argument. By the end of the month SC & CR were my strong areas.
8. Give 1 full test everyday, including AWA & IR. You need to make the exam day feel like a normal day.
9. Everyday schedule: 3.5hrs exam + 2-3 hrs analysis + 6-9 hrs practice.
Practice is very important. I'm asking you to study 12-16 hours a day. But believe me it will pay off.
10. By the end of week 1 you'll feel like quitting. But remember 25% of the journey and the hardest part of the journey is over. You'll start liking the studies because one likes what he/she is good at. It's like you're exercising, it's paining, but the muscles are not showing. Have patience.
11. By the end of week 2 you'll be scoring 620-660. You'll be stuck in this barrier for a long time. Keep working. Your aim is 700+.
12. By the end of week 2 and start of week 3, you'll know exactly what to do. Trust me.
13. I started scoring 700+ by mid week3 and throughout week 4.
But scoring 700+ just once is not enough for students like us. We need to make it a habit.
14. My GMATPrep scores 600(start), 640(week 2), 740(2 days before exam), 730(day before exam).
My GMAT score: 710(Q:49,V:38)
I'm an engineering student working in the Indian IT world. Imagine taking a 30 day leave.
I've applied to top 10-20 business schools in the US and am awaiting interview calls.
All the best.
Also, the GMAT is only a gateway to top schools. You need to work a lot harder in the applications. So, start working hard. Work hard for yourself. Be selfish.