Yes, 12th-grade marks are typically important for studying abroad, as they are a key component of your academic record. Many universities assess applicants based on their high school or secondary education performance. While low 12th-grade marks may not necessarily rule out the possibility of studying abroad, they can impact your chances of admission, especially at competitive institutions. However, some universities also consider standardized test scores, recommendation letters, and personal statements, providing opportunities to offset weaker academic performance. It's essential to research specific university requirements and explore options like foundation programs if needed.