First, 750 is a REALLY high score. Just FYI - I can't give anyone a "reasonable" general timeframe for that goal because only 2% of people ever hit a score like that in the first place.
But it's good to have ambitious goals!
Most schools release their applications around June or July, and first round deadlines are often in September or October, so if you want to be able to start working on them right away, then you may want to aim to try to have your studies done by June. (That also gives you a bit more time just in case you get sick or something else happens to delay your studies.)
You can download 2 free practice tests from
www.mba.com (the official website) - look for GMATPrep in their store. (The cost is $0.) You have 6 tests that come with our books, for a total of 8. GMATPrep also has two more paid tests that you can unlock (last I checked, they cost about $40), but 8 tests should be more than enough.
We have our class students take a test right at the beginning - before they even start studying! This allows you to see your baseline and to get a handle on your strengths and weaknesses. That will help you to prioritize your studies, so I strongly recommend taking a test ASAP.
Next, I'd recommend taking your second test when you've worked about 50-70% through our books. Don't expect a huge jump in score. In fact, a lot of people see a score
decrease at this point. Essentially, they've learned a lot of stuff that they think they "should" be able to do now when they see it on the test - but they're still a bit slow or not entirely comfortable with whatever that thing is. So they spend too long on a bunch of questions and really mess up their timing - and if you mess up your timing, you're going to hurt your score.
But you still want to take a test at that point so that you can continue to acclimate and get used to the testing environment. You also, again, want to see what your strengths and weaknesses are so that you can continue to appropriately prioritize your studies.
Plan to take another test when you're through all of the books for the first time. After that, you're going to use your test results to drive your review (more on this below) and you're going to take a new test approximately every 2 to 4 weeks (depending upon how much you're studying - the general rule is that you take a new test when you feel that you've tackled all of the major issues you wanted to tackle based on the results of your previous test).
Here are some resources to help you with the strategic side of things:
Mindset:
http://tinyurl.com/executivereasoninghttps://www.manhattanprep.com/gmat/blog ... -the-gmat/How to study:
https://www.manhattanprep.com/gmat/blog ... our-score/http://tinyurl.com/2ndlevelofgmathttp://www.beatthegmat.com/mba/2015/07/ ... s-say-whatTiming:
http://tinyurl.com/GMATTimeManagementAnalyze your MPrep tests:
http://tinyurl.com/analyzeyourcatsGood luck - let us know how it goes!