<p>I took Practice test #6 in the blue book and I got 7 Math questions wrong. All of them were categorized as hard.
Does this mean that I should review Grubers, Dr Chungs, or both?
I have and used both books but I guess my memory and understanding was not 100%.</p>
<p>It depends on the actual concepts, not just if they were hard. Depending on those types of questions, if it seems you consistently get those wrong, then focus on those types of questions in either of the two books. I personally like Grubers.</p>
<p>simple, if you generally score 650> in math, get chungs, and if 650<, get grubers.</p>