Yes, 12th marks are important for aerospace engineering admissions. Colleges typically require good scores in Physics, Chemistry, and Mathematics, as these subjects are the foundation for the field. Prestigious institutes like IITs use entrance exams like JEE, where 12th marks are crucial for eligibility. Some universities consider 12th grades for merit-based admissions. Strong 12th marks also reflect your academic discipline and help you grasp challenging topics in aerospace engineering. While entrance exams hold significant weight, maintaining good 12th scores improves your chances of admission and prepares you for future studies in this competitive field.