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<p>Early graduation from high school is unlikely to be helpful unless you have truly exhausted all educational opportunities there, including being able to take useful college courses while in high school (including dual enrollment).</p>
<p>If you graduate from high school on normal schedule, but have completed useful college courses by then (particularly math and physics suitable for engineering majors), then you will likely enter college with the option, but not the requirement, to graduate a semester earlier than your normal schedule would have been.</p>