There are a number of full length GRE mock tests available online.A few of them are available for Free. Taking a mock test significantly improves your time management skills as reported by GRE takers.

For more details please read: Is taking too many Practice tests counter productive?

ETS GRE Power Prep II:

Test

Princeton Review's Revised GRE Practice test:

Test

Manhattan Free Full length GRE Practice Test:

Test

Kaplan's Free Practice Test Options for the GRE:

Test

Peterson's FREE GRE Practice Test

Test

MyGREtutor:

Test

800Score's Free Full Length Revised GRE Test:

Test

McGraw-Hill GRE Practice tests:

Test

And Finally we have 20 full length practice test at GRE Guide.....

GRE Guide.com Practice Tests:

Tests

And Finally we have here part tests for GRE (Subjectwise) at

TCY Online.

Tests
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Sandy
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Is Perterson's GRE book helpful enough to practice? At this time, I have only this one.
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I am doing it.

Probably MGRE, even though is a bit on the tough side.

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The above mock tests are some of the best ones. But, if anyone's looking for more, there's this GRE Practice Test by Galvanize that I'd like to recommend. It is a 65 minute test and they give a full report at the end of the test which really helps in understanding how much you need to prepare. The questions asked are really good. Do check it out once.