Can a 17-year-old legally drop out of high school in Texas?

No it's not illegal. I personally know many people who don't even go to H.S. they drop at the eighth grade. But why would you want to at 17? you only have one more year and getting a GED isn't all it's cracked up to be? * A person under the age of 18 may not leave school without the permission of their parents or legal guardian. A minor child who has reached the age of 17 and been granted an equivalency certificate is exempt from compulsory education laws. Texas Education Code Annotated 25-085(b).