I am providing list of all best books for GMAT Test by suggested by MBA Crystal Ball:

Books for GMAT suggested by MBA Crystal Ball

Best GMAT Books
Manhattan GMAT Strategy Guides (8 Books)
The Official Guide for GMAT Review
Kaplan GMAT 800: Advanced Prep for Advanced Students

Top GMAT Quantitative (Maths) Books
Kaplan GMAT Math Workbook
The Official Guide for GMAT Quantitative Review

Best GMAT Verbal Books
Manhattan GMAT Sentence Correction Strategy Guide
The Official Guide for GMAT Verbal Review
Kaplan GMAT Verbal Workbook

Here I am providing sample questions of GMAT by MBA Crystal Ball for your reference:

Question:
A new motorcycle produced by ABC Company has a mileage of 40 miles per liter at 40 miles per hour. The mileage drops to 30 miles per liter if the speed reaches 50 miles per hour or drops to 30 miles per hour. What are the maximum and the minimum distance the bike can travel in ten hours and with ten liters of fuel if the speed during the entire journey is constant. Assume that the bike can go only at speeds of 30, 40 and 50 miles per hour. Make only one selection in each column.

Maximum Distance Minimum Distance Distance in miles
_______________ ________________ 200
_______________ ________________ 300
_______________ ________________ 400
_______________ ________________ 500
_______________ ________________ 600
_______________ ________________ 800

A. Minimum = 200, Maximum = 800
B. Minimum = 200, Maximum = 400
C. Minimum = 300, Maximum = 400
D. Minimum = 400, Maximum = 500

Question:
Companies can attract a great number of new customers by discounting prices on their products. However, discounted prices usually lead to lower profit margins on sales. Therefore, companies that already have low profit margins and cannot decrease their prices any further will not be able to attract a great number of new customers.

The argument above is flawed because it fails to consider that

A. It is possible to attract some new customers without discounting prices.
B. It is possible for companies to attract a great number of new customers without significantly discounting prices on their products.
C. More customers do not necessarily mean greater profits for the company.
D. A great many new customers may be attracted by means other than price reduction.
E. Many companies have significantly increased their profits without discounting prices on their products.

Question:
If y+40x+2=0, what is the value of xy?

(1) 16x=–4y+28
(2) 13y =91–52x

A. Statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient.
C. The two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient to answer the question.
E. The two statements TAKEN TOGETHER are still NOT sufficient to answer the question.

Question:
To pass a certain test, the ratio of the number of mistakes to the number of questions in the test must be lower than 7:40. If the test has 100 questions, what is the maximum number of mistakes Jack can make so that he can still pass the test?

A. 15
B. 16
C. 17
D. 18
E. 19

Question:
It takes the heat of large stars or supernovae to cause the fusion of magnesium with hydrogen, creating a chemically stable aluminum. Since aluminum is one of the most abundant elements on Earth, it can be inferred that, at least at some point, the temperature inside or outside Earth was comparable to that on large stars or supernovae.

Which of the following, if true, causes most damage to the conclusion of the argument above?

A. Creation of stable aluminum requires distinct pressure conditions not typical of contemporary Earth.
B. Some of the aluminum found on Earth was brought here with asteroids or other cosmic bodies that were parts of large stars or supernovae.
C. Most aluminum on Earth comes in oxides, and native aluminum can be found only in low oxygen environments.
D. Aluminum found on Earth has several vacant electrons that have to be artificially removed in order for it to become chemically stable.
E. Magnesium itself can only be formed under strictly defined conditions.

Question:
Read the sentence below and choose the option that best replaces the underlined section

Like humans, who can recognize another’s knowledge and beliefs—an ability that may not be unique to mankind — reading others’ intentions and displaying awareness of what others see seem within the capabilities of some non-human primates.

A. reading others’ intentions and displaying awareness of what others see seem within the capabilities of some non-human primates.
B. the capabilities of some non-human primates include reading others’ intentions and displaying awareness of what others see.
C. some non-human primates seem capable of reading others’ intentions and displaying awareness of what others see.
D. some non-human primates‘ ability to read others’ intentions and displaying awareness of what others see.
E. non-human primates, reading others’ intentions, seem to have some abilities of displaying awareness of what others see