Is this Enough for the Math Subject GRE? [closed]

I have been studying for the math GRE for quite sometime now. I have been going through the princeton review and old GRE tests, and in fact without much very difficulty at all. As a way of getting more practice, I got myself a copy of "The Best Test Preparation for the GRE" produced by REA. Aside from the extraordinary number of typos and errors in solutions, I have noticed that some of the questions in REA are considerably more difficult than the ones in the Princeton Review and practice tests, involving some rather off the wall, obscure topics. Has anyone else noticed this when they compare REA to the practice tests; how about when comparing the REA book to the actual test? I ask because if the actual test is as difficult as the REA, I definitely need to do some more studying. I have read on several different places on the internet that this is the case (that many of the questions in the REA book are at a higher level, that they are obscure and/or unlikely to find their way on an actual GRE, etc.), but I am looking for further corroboration or disconfirmation of this.

The reason I ask is because I am quite worried about the GRE, so much so that I spend nearly the entire day every day studying for it, and I am not exaggerating--okay I occasionally take a Saturday off. This has taken away some time from studying higher maths to prepare me for graduate courses (e.g., going through Rudin's Real and Complex Analysis, a book on functional analysis, etc.), which I find very frustrating. So I am looking for advice: I don't want to waste time by over-studying for the GRE, but I also don't want to get a bad score.

In short, my first question is, how do the REA tests compare to the two other sources I have been using; and my second is, will doing well on the practice tests and Princeton review suffice to increase the probability of success on the GRE (i.e., is this enough)? If not, do you recommend going through further sources; are there any other practice test lurking out there? I have only been able to find four. I plan on working through Stewart, Friedberg, a few of Schaum's books, etc. Are there books superior to these?

EDIT:

I just want to thank everyone for their input. I definitely feel reassured and not as anxious over this test. I feel that I can reduce the intensity of my studying, and happily go back to studying graduate topics! I think I will still go through REA's book, but it certainly won't be my primary source anymore.

closed as off-topic by TheGeekGreek, Morgan Rodgers, Sahiba Arora, Lord Shark the Unknown, JonMark PerryAug 8 '17 at 5:07

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is not about mathematics, within the scope defined in the help center." – TheGeekGreek, Morgan Rodgers, Sahiba Arora, Lord Shark the Unknown, JonMark Perry
If this question can be reworded to fit the rules in the help center, please edit the question.

• This is kind of the wrong place for this question, but do you mean the math subject GRE or the math part of the general GRE? The latter is pretty easy, it's just a matter of speed. The former is tough but the level you need for it depends very much on the level of graduate school you want to attend. – Ian Aug 8 '17 at 0:18
• @Ian I mean the math subject GRE. – user193319 Aug 8 '17 at 0:20
• I will say that my specific experience was that the Princeton Review problems were significantly easier and less widely varied in topics than the actual test I took. But this was in 2011. – Ian Aug 8 '17 at 0:23
• Closer, but I still recall the same kinds of frustrations (inadequate prep on some of the less represented topics). My algebra and topology backgrounds were both quite limited at the time however. – Ian Aug 8 '17 at 0:27
• @user193319 the best preparation is via the old ETS tests. In my experience I found that REA authors attempt to mimic the ETS test questions and sometimes they make the questions either too hard or too easy. – Mustafa Said Aug 8 '17 at 0:30

From my year, the two people who scored $99\%$ and $98\%$ that I know were rejected by the admission... People who were admitted scored around $75\%$ to $95\%$ (though I do not have a very large data pool).