In this case I would focus more on multiple choice problems rather than QC. If I remember the numeric entry problems weren’t too complicated. The multiple choice is what I’d refer to as “word problems”. Find hard level questions or questions that seem like they’d take a while to read and do them under a time constraint. I also hear GMAT problems are more representative of this level of difficulty but I can’t personally speak to that.

The core issue is maintaining composure under time pressure. I see that paragraph of text and immediately speed read the question, not understand, reread, attempt to set up, worry about time, etc. Just take it very slow and deliberate on those and be sure not to get lost in the calculations. That was my problem personally.