You had very few wrong answers on the quant, actually - unusually so. Most of the time, people only get between about 50% and 70% of the questions right, regardless of scoring level. So the fact that you scored a 47 on quant even after 3 unanswered questions means that you were scoring VERY highly on the quant - and that is backed up by the fact that you had only 6 wrong answers for the ones you did answer.
That's just the way the test works. Scores are not strongly correlated to the percentage correct; rather, they are most strongly correlated with the difficulty levels of the questions you get right vs. wrong. As a result, EVERYbody gets lots of questions wrong, even at a very high scoring level - many more questions wrong than you would expect on a regular, paper-based test.
I'm glad you've improved your timing on the quant - keep working at it. In future, NEVER leave anything blank. Guess randomly if you have to, just to fill in the last three (or however many). The penalty for a blank question is always higher than the penalty for a wrong question. In addition, if a particular question was scheduled to be an experimental question and you leave it blank, you get the same penalty as if it were a question that was supposed to count. If you answer it randomly and get it wrong, though, then you have no penalty!
For quant questions on which you spend more than 4 minutes and still get them wrong, you should get them wrong in 2 minutes instead. I'm completely serious. You should not expect to get everything right. You should only expect to be able to recognize when the test has given you something that's too hard, and then you should let go before you've lost time on that problem.
Ideally, on a "too hard" problem, you recognize that by the halfway mark (1min on quant) and then you spend some or all of the 2nd half eliminating wrong answers before you guess. (This is called making an educated guess and it improves your odds of guessing right.) But you should also not be disappointed at all if you still get that one wrong, even with an educated guess. Think about what's going on: the test just gave you a problem that's way too hard for you. Do you really want to get it right? You're just going to get an even harder question! Forget that! :)
For most people, improving methodology means (a) studying from GMAT test prep-specific materials (so not OG stuff, but stuff from a test-prep company) and maybe taking a GMAT class, and (b) constantly asking yourself "what problems have I seen in the past that were similar to this one in some way, and what was the best way to do those past problems? Are there any other, better ways to approach something like this?"
Re: practice tests, I will repeat what I said before, with emphasis added:
CAT exams are really good for (a) figuring out where you're scoring right now, (b) practicing stamina, and (c) analyzing your strengths and weaknesses. The actual act of just taking the exam is NOT so useful for improving. It's what you do with the test results / between tests that helps you to improve.
Do NOT make the mistake of thinking you have to "finish" the tests just for the sake of finishing them. If something isn't that useful, then you shouldn't be doing it, period. I would FAR rather have you take only 1 test per week but use the test results to define your study plan (and then go do that study) before taking another test.
If an analogy helps, think of tennis (or insert your favorite sport here). When you're watching professionals play a match, they are not learning much WHILE they are playing that match. They are DOING, not learning - just doing everything that they learned / planned
before the match started. The learning comes afterward, when a player watches a tape of the match with his/her coach and discusses what went well, what needs to change before the next match, etc. The learning also comes during the practice the player does before the next match. When the next match rolls around, the player is back to
doing, not learning or practicing.
The tennis matches, in the above analogy, are the GMAT practice tests.