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Now, on to your question.
Now to do some practice, and to gauge my score improvement before my second GMAT test in a month, please let me know what new exams I could use
Stop taking so many CATs. Seriously. :) That's not how you learn to get better. Read this:
https://www.manhattangmat.com/blog/inde ... many-cats/If you'd like to get advice about what to do, use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/Then come back here and tell us the results of your
analysis and what you think you should do based on that analysis. We'll tell you whether we agree and advise you further. (Note: do share an analysis with us,
not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)
Also, read this:
http://www.manhattangmat.com/blog/index ... -the-gmat/Pay particular attention to the How To Learn section.
You mention that you're planning to take the test again in a month. Is your goal to take the test in a month (maybe you have a deadline)? Or is your goal to earn a particular score? If your goal is more about the score, then don't base your study on choosing a test date now. Wait until your practice tests (taken under full official conditions, including essay and IR) are in the range that you want.
And finally:
You can still take both GMATPrep and MGMAT CATs with repeats as long as you follow a few guidelines to minimize the chance of artificially inflating your score via question repeats.
First, don't go back and study those questions. Forget about them. You're not going to take another test for 2 or 3 weeks.
Next, when you do take a test, anytime you see a problem that you remember (and this means: I know the answer or I'm pretty sure I remember the answer, not just "hmm, this looks vaguely familiar..."), immediately look at the timer and make yourself sit there for the full length of time for that question type. This way, you don't artificially give yourself more time than you should have.
Think about whether you got this problem right the last time. If you did, get it right again this time. If you didn't, get it wrong again. If you *completely honestly* think that you would get it right this time around if it were a new question (even though you got it wrong last time) because you've studied that area and improved, then get it right this time.