If you already are in the habit of doing challenging reading on your own, then by all means, continue reading what you want. For more on how to use outside reading to prepare you for the GMAT, see:
For those who want neither to estimate one’s abilities nor to consider eagerness, there is a possibility to pay for essay.
Improper word choice — for example, the use of the superlative "best" where the comparative "better" is proper, or vice versa
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