Are the "GRE Quant Problem Solving" problems in GregMat.com from official GRE materials?

Are the “GRE Quant Problem Solving” problems in GregMat.com from official GRE materials?

Apparently nope.

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Definitely not.

I feel like the hard “GRE Quant Problem Solving” problems are much harder than the actual GRE hard. Am I right? And where are these problems from?

This is potentially right - some of the problems are definitely harder than what you’ll see on the GRE - but some of them could be fair game for a difficulty 4 or 5 problem.

The GregMAT team writes them.