Yes you can take it the test online; However, you will still need to go to the DMV to complete your application and take a picture for your license.
You will need a webcam connected to the computer you want to take the test on. The DMV will not record the test but take pictures of you during the test. The test will have 50 questions. Once you clicked to take the test you have 15 minutes to start it before it expires. During the test you don't have a time restriction.
Don't know, I don't think so, try the app instead.
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