Princeton Review GMAT Premium Prep, 2023: 6 Computer-Adaptive Practice Tests + Review & Techniques + Online Tools (Graduate School Test Preparation)

I am still going through the book. I revised my rating from a 4 star down to 3 star because of a number of mistakes I found in Diagnostic Test 2. I'm more proficient with math than language. So to think I've found this many mistakes on the math section alone makes me question how many I've missed in other sections of the book. There are answer keys to verbal questions that I strongly disagree, (e.g. pg 547, question 8-2) but I'm not going to be label them as wrong. Reasoning and analytical questions have a lot more gray areas. Math, on the other hand, at least the math GMAT deals with, are pretty clear cut.on pg 293 Drill 13 Question 4, the answer B is incorrect, the question maker forgot to flip the minus sign on the Y-intercept when dividing both sides by -8. If you plot both coordinates, the Y-intercept is clearly positive, not -65/4.on pg 332 Drill 16 Question 3, the answer key use x and y = sqrt(2) to justify E, which is incorrect. sqrt(2) doesn't satisfy the 2nd statement x+y is an integer.I can show that there are no decimal pairs that can satisfy both statements. If x+y is an integer and x is a decimal. let's set A to the decimal portion so 0<A<1; B, the decimal portion of y would be 1-A. To satisfy xy is integer, A*B must be integer (0 or 1). AB = A(1-A) = A-A^2. Since 0<A<1, A^2 is always a smaller positive number than A. AB will never be 0. Hence there are no decimal pair that could satisfy both statement 1 and 2.pg 643, diagnostic test 2, Arithmetic #2, typo, the number should be 25,000, not 25,0000. Answer key use 25,000.pg 647, diagnostic test 2, Geometry #6 is unsolvable. The statement only shows that Triangle ABC and EBD are Isosceles Triangles. In theory, angle ABC and EBD can be any number less than 180 degrees. Angle ABE cannot be found unless there's more information. The answer key makes no sense.pg 650, diagnostic test 2, Algebra #8, a typo, the question should ask for s^5, not s^6. s^6 does not have a single solution.pg 650, diagnostic test 2, Algebra #9, answer key wrong. In the answer key, when the writer was evaluating statement two, 2 was used as an example, because "4>=1", but because of the negative sign, number 2 does not satisfy statement two.To properly solve this, we need to simplify the two inequality by removing the negative sign and negate the inequality.Statement 1 is: m^3 >= 1 (m is positive number >= 1, not necessarily an integer)Statement 2 is: m^2 <= 1 (-1 <= m <= 1)Each statement alone is not sufficient, but the only number that can satisfy both statements is the number 1. So the answer should be C.

As someone who is prepping to take the GMAT for grad school applications I will say this is a great tool to prepare you. The book huge! A lot of great content. I haven’t completed the whole thing yet but what I’ve done so far has absolutely made me feel more prepared for the exam but also put my mind at ease as to what to expect on testing day.