Hi, you need to turn yourself into a GMAT robot
Throw away Barrons, McGrawHill, Manhattan, etc. They're useless. All you need is OG, the 1000 sets and GMATClub
For Quant, here's what you do:
Get OG, and do every single DS & PS problem in there. Try to do 50 problems a day, you can get through OG in under 2 weeks. Anyways, the key is, TIME yourself -- I use a stopwatch. Give yourself a max of 2 minutes, if you can't answer it easily in 2 minutes, mark it wrong, and review it later. Each time you get a question wrong, look at why you got it wrong-- Were you just slow? Do you not know the underlying concept? etc... IF you were slow, do a few practise problems with the same concept until you get faster. If you don't know the concept, then learn it! Anyways, the idea is you want to be able to look at ANY OG question, and be able to solve it within 120 seconds flat, without really thinking too hard..... I think that's the key.
For Verbal, well, that's a *complain*. For me I just 'get' CR, so I never study that..... same with RC. SC though, I just do a hell of a lot of practise. I would just recommend going through about 200 CR's, that's a good amount, and trying to understand how the GMAT test writers are trying to trick you..... once you learn how to think like them, you'll know what tricks to watch out for. RC is just practise, practise and more practise. Honestly now when I do a CAT, by the time I get to verbal, I can't make ANY sense of the passages -- but subconsciously I remember things.. it's weird. Like I can read a passage, have it not make any sense, then read the question, and be like boom that's the answer...... I think you just need to do a lot of long, complicated passages to get the hang of it.
For SC, same thing as in Quant, time yourself each time, giving yourself a max of 2 minutes. You should know the idioms, the things to watch out for, etc. I think if you can do SC1000 or OG with 85%+ right you're set for SC.
If you do 200-250 CR, 50 passages, and about 1000-1500 SC's, I think you can easily get a 45 verbal.
And if you do 500 DS & 500 PS, you can easily get a 48+ score
I think this is an easier approach then bothering with all those stupid books. Their explanations are terrible.... read the explanations from OG, and pay particular attention to how the test writers DISMISS incorrect answers... put yourself in their shoes. Learn how to think like they do. It gets much easier then!
Let us know how your progress goes. Also you wrote GMAT 3 times?? How far apart? I think you should have done a lot better, did you not study in between? Well, if you did, it didn't help! You should give what I said a try, that's what I did and I'm scoring mid to high 7's now, and I started off in the 500's