Can pre 18 years old student enroll high school without guardian I will be before the started but 17 when fill out application?

It depends on the state and school district. In some states, students can enroll in high school without a guardian if they are at least 16 years old and have completed the eighth grade. In other states, students must be at least 18 years old or have a guardian in order to enroll in high school. Some school districts may also have their own policies regarding the enrollment of students without a guardian. It is best to contact the school district where you wish to enroll to find out the specific requirements.