What do you think the diffrence is between 48Q scorer vs 50 for 51Q scorer?
In my opinion, the difference is of one word - Why
As we all know, the theory tested in GMAT is very limited and very basic. All the questions are based on that same theory. The thing about Q50-51 questions is that it is hard to identify the theory they are testing. You might need to use the same simple formula but you will be left wondering which formula to use and how to use it since some manipulation might be required. That is where knowing 'why' helps. You need to understand the 'why' behind everything - every fact, every formula, every process. If you do, then it doesn't matter how they twist the question, you will know what you should do and why.
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