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Thing is, I need to leave for MBA this year, otherwise I won't be getting anywhere for the next 2 years. Military obligation is a pain in Turkey.
I see. That changes things. I would suggest doing the entire OG and the supplements. Start doing the first third of each section (if you're aiming for a 670+, you should breeze through these problems). Then, do the second third and finally the last third. Learn the concepts. For every minute you spend on a question, spend two on the explanation.
If you have vacation time available at work, now is the time to take it.
If I told you that you could take the actual gmat, but you can't keep nor cancel your score would you want to take it? Good, because that's what the GMATPrep is. It is the actual gmat, but the score doesn't count.
Take it around week 2/3 and then for the last 3-4 days, take the test every day. Get used to it, it is nearly identical to the real thing.
Good luck!