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.

Regards
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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.

Are all those tests completely free?
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