Hi omega11,
It's common for Test Takers to have to 'adjust' their study plans (and timelines) once they get a bit into the process a bit. Part of the reason why is because they really don't know how big the task really is and part of it is they don't have a sense of their own abilities yet.
While you *want* to take the GMAT on April 29th, the REAL goal is to get a GMAT score that will help you get into a Business School of your choice. If that process takes longer than you want it to, then so be it. The MBA is worth it (and the alternative is to give up, which doesn't seem like a good idea).
Based on your post, you started studying on Feb. 23 (and today is March 12), so you've been studying for 18 days on this current plan - NOT a month. I'm not sure if you were expecting to become an expert so quickly, but most Test Takers need 3 months (or more) to hit their 'peak' scores. You've been at this for 18 days and your current timeline is planned out for about 65 total days. This means that you're relatively 'early' in the process and your timeline is about 1/3 less than what most Test Takers spend. This is all meant to say that you're trying to accomplish a lot in less time than you probably need, so you MIGHT have to adjust your plans a bit.
You shouldn't be too worried just yet about your scores. Continue to study for the next couple of weeks and then take another FULL-LENGTH CAT. If you're not making progress, then it will be obvious and we can then work through some ideas.
GMAT assassins aren't born, they're made,
Rich