Hello
Ok... good start, this score of Q-43 and V-35 suggests that your main strength is in Quant (take three/four consecutive tests and see how does your Quant score behave)
Now for Quant
1) Did you find the areas where you got questions wrong ( are they same as gmatprep, if yes, you know the area you can work upon)
2) Did you skip Questions ?
3) In how many Qs did you take more than 2.5 mins and in how many Qs did you take more than 3 mins ( what was accuracy with respective ones)
GMAT algorithm is not known to any one, every prep company tries to match its algorithm based on its experience, I can tell you that
MGMAT algorithms are probably the closest to real GMAT quant.
I would suggest you not to evaluate your performance on the no of questions you got wrong ( this data can help you to gauge your understanding of topic only )
You may take test every alternate day, but do not take tests in last three days, and analyze your test on above points for at least an hour.
Do not fear about getting Qs wrong (especially 700-800), you are bound to get some Qs wrong. Since the test is adaptive, once you start performing well, the test tries to knock you by throwing tougher question every time and some or the other time you will be knocked, so this does not mean that once you get a couple of Qs wrong your scores will fall like anything.
Analyze your test as much as you can.
After taking four/five tests, you should list out your strengths and weaknesses.
Your strengths : list out the areas, so on gmat day, you know where you can invest your extra 30 to 60 seconds.
Your weaknesses - you can have some educated guessing strategies to tackle such questions. you can utilize the saved time to work on your strengths, and believe me you will have decent difference in your scores with this strategy.
For your verbal , do the same exercise - expect a tougher verbal at real GMAT than
MGMAT.
hope this helps