I got this from them:

Even though there is no correlation with real exam scores, you should be in very good shape if you score over cum-performance 55-60%% in our Qbank, this is based on the feedback that we received from previous exam takers.

Also they said this:

Use our QBank as a learning tool instead of assessment tool.

Try to go over all questions number of times and read the explanations for 2-3 times.
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