Elon Musk’s preschool, Ad Astra, has these criteria for admitting students

Ad Astra, a pre-school established by tech giant Elon Musk is located outside Bastrop, Texas.
"We are pleased to announce that Ad Astra School's inaugural class will launch in 2025. The admissions for Ad Astra School are now closed," the school says on its website.
"Children who turn 6 on or before September 1st are well prepared for transition to elementary school. Children must be toilet-independent before beginning the Primary program at Ad Astra," the school says.
The school aims to run with a teacher-student ratio of 12:1 for primary classes and 1:15 for lower elementary. The ideal teacher-student ratio depends on the level of education and teaching methodology. For early childhood education, a 1:10 ratio is considered optimal, ensuring personalized attention. In primary schools, a 1:15 to 1:20 ratio helps maintain effective learning. For secondary education, a 1:20 to 1:30 ratio is common, balancing individualized guidance with peer interaction. In higher education, ratios vary, with lectures accommodating larger groups but smaller tutorials ensuring deeper engagement. Research suggests lower teacher-student ratios improve learning outcomes, student engagement, and overall academic performance. However, quality teaching, curriculum design, and resources also play a crucial role in effective education.
The school conducts individualized assessments to identify developmental issues in kids.
At lower elementary level the school aims to impart science, technology, engineering and mathematics (STEM) knowledge and prepare kids "to tackle the challenges of the future, with the skills and mindset of true problem solvers and builders." Problem solving and building, critical thinking, math and science, curiosity, creativity and global citizenship are a part of the curriculum.
At primary level, students will be taught to have mathematical fluency, a scientific mind, independence, focus and concentration and grace and courtesy.
Musk founded Ad Astra in 2014 as a private school initially intended for his own children and a small group of SpaceX employees’ kids. The school aimed to cultivate critical thinking, encourage curiosity, and develop problem-solving skills rather than rote memorization. The core idea was to break away from the outdated education system and instead focus on real-world applications of knowledge, emphasizing science, mathematics, engineering, and ethics.