ArvGMAT, (I am responding to your personal message here. Who knows, someone else may also benefit from it)
Thanks
I think that you should focus on your weaknesses during this one remaining month that you have. You stand to gain the most by working on your weaknesses. The practice tests (retired paper tests or whatever) that you take will ensure that you are not neglecting your strengths either. To ensure that no area is neglected, you can also consider visiting the Math/Verbal Question sections.
I wouldn't suggest you to spend too much time on Probability (It's a very small part of the GMAT maths section). Perhaps you can spend one day in understanding the theory, and one in solving various kind of problems. During the later stages of your preparation, you'll keep getting probability problems here and there to keep your concepts tight. GMAT probability is not very complicated anyway.
SC was my biggest weakness too. Initially I was trying to pick the sentence that
sounded right to me. But most of the SC questions in GMAT are based on simple rules that the
OG and Manhattan SC guide mention. So, instead of relying on your feeling (Which is wrong quite frequently), trust the rules that you read in those guides. I went through the Manhattan guide a couple of times, and I did all the
OG problems. Doing
OG problems means reading the solution too (Not just checking if you chose the right answer or not).
Finally, I think that GMATPrep is a good indicator of your potential GMAT score. If you aren't happy with the score that you are getting from that software, then perhaps you should give yourself some more time to prepare.
I am applying in 5 of the M7 schools (3 in R1, 2 in R2). Let's see how it goes. All the best for your endeavor !