Good questions to ask! You're just a little ahead of things, that's all. There isn't a way to tell this far in advance what you should be doing after the course is over. At the end of the course, when you take your third practice test, you will have an idea at that point as to whether you are close to your goal or whether you still have a lot of work to do.
For example, if you take your practice test under full official conditions (including essays!) and score a 700, for example, and your goal is to score 650+, then you may only want to review for a couple of weeks before taking the real test. If you score a 600 and want to score a 650+, then you'll know you have more work to do before you can take the test.
At the end of your program, you'll have the opportunity to request a Post Course Assessment (PCA) from your instructor. To qualify, you have to have taken the three practice tests listed on your syllabus. Your instructor will then take a look at your results and tell you what s/he thinks you should do between the end of your course and your test date. You can tell your instructor that you're not sure when to take the test and ask his/her advice, based upon your specific progress relative to your goal.
Finally, make sure you base what you do every day on your current strengths and weaknesses, not just your goal. It is rarely a good idea to work ONLY on 700+ questions, because it is rarely the case that someone will be able to master ALL of the sub-700 level questions. Even if you do get something right, you may also need to work on your timing - can you do it in the expected timeframe without sacrificing accuracy?
If yes, there's even another step: can you do it a bit more quickly than expected without sacrificing accuracy? If your current scoring level is 650, but you want to move to 700, it's not enough just to say, ok, I got the 650-level Qs right. If I'm going to perform at an average 700 level, then I will still get some 650-level Qs, and I will need to be able to do them MORE quickly than I did them before, because I will be seeing a harder mix of questions. As I get better, the questions that become
my "lower level" questions on the test
also have to be answered somewhat faster.
When your practice test scores are in the range that you want to score on the real test, you're ready to take the real test. NOTE: this assumes that you take the practice tests under 100% official conditions. If you skip the essays, or take longer breaks than allowed, or use the pause button, or deviate from official conditions in general, then your practice test scores might be inflated.
When you get closer to having to work on your own, these articles may be useful for you:
http://www.beatthegmat.com/mba/2010/02/ ... study-planhttp://www.beatthegmat.com/a/2009/09/23 ... tice-testsStarting now, these articles will be useful for you:
http://www.beatthegmat.com/a/2009/10/09 ... ce-problemhttp://www.beatthegmat.com/mba/2010/04/ ... our-errorsI also recommend that you read the free e-book in your Student Center account - it's called The GMAT Uncovered and it's already in there, waiting for you to read it. :)