Accessing free GRE practice tests online is straightforward and offers a range of options to help you prepare effectively. Here are some of the best resources I've found useful:
Magoosh
Magoosh provides a comprehensive free GRE practice test that closely mimics the actual exam format. It includes 54 practice questions and an essay prompt, allowing you to experience the test environment. After completing the test, you'll receive an estimated score along with a detailed performance breakdown and explanations for each question. They offer different formats, including a full-length exam, shorter diagnostic assessments, and single-section tests, which can be very helpful depending on your study schedule1.
ETS POWERPREP
The Educational Testing Service (ETS), which administers the GRE, offers two free practice tests through its POWERPREP Online platform. These tests simulate the actual GRE experience and provide scores for the Verbal and Quantitative sections. While they don't include detailed explanations like Magoosh, they are invaluable for understanding the test structure and timing2.
Mometrix
Mometrix features a selection of free GRE practice questions that cover both Quantitative and Verbal reasoning. Their resources are designed to help you identify areas where you need improvement. They also suggest strategies for taking practice tests effectively, such as starting without time constraints and gradually simulating test conditions as you progress3.
Kaplan
Kaplan offers a full-length GRE practice test that can be taken at your convenience or in a live online setting with an instructor. This option provides immediate scoring and a breakdown of your strengths and weaknesses, making it easier to focus your study efforts4.
Manhattan Prep
Manhattan Prep's free GRE practice test is another excellent option. It features adaptive calibration similar to the actual GRE, allowing you to select section order and assess your baseline score effectively

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Lastly follow these tips to complete your GRE preparation:-

1. Begin practice with no time constraints
2. Then slowly use timed practice test
3. review mistakes and repeat.