See this page: https://dmvnv.com/nvdlteens.htm Your parents can attest that you are not in school.
You have to take your written exam and vision test to get your learners permit and drive with a licensed driver thats 21 or over for 6 months in order to take the physical driver exam. I'm not sure about driving laws for those under the age of 18, though. Go to the nvdmv website for that information. They're not taking appointments currently but, I believe you can get in for your written exam if you check for cancelations each morning. You can at least get started with the process. I went to the Sahara office and the employees were very helpful getting me started with it.
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