Hi koreafort,
It sounds like you've been studying for just a few weeks, and it's understandable that you'd want to familiarize yourself with the material. However, you've skipped an IMPORTANT part of the process....taking a FULL-LENGTH CAT so you can get a 'baseline' score and have a basis for comparison. You mentioned wanting to score a Q50, but we don't even know what your current "level" is yet, so we have no way of knowing if you're actually studying the right subjects (or doing so correctly).
For all those reasons, in the beginning, taking a FULL-LENGTH practice CAT is important; you can download 2 for free from
www.mba.com (and they come with some additional practice materials). A FULL CAT takes about 4 hours to complete, so make sure that you've set aside enough time to take it in one sitting. Once you have those scores, you should report back here.
You've given yourself plenty of time to study, which is good. Right now, it sounds like you're studying too much though. Doing 35 hours/week of study might lead to "burn out", which we want to avoid.
I'd like to know a bit more about your goals:
1) What is your goal score?
2) Have you thought about which Business Schools you want to apply to?
GMAT assassins aren't born, they're made,
Rich