成功完成高中教育的学生将获得南澳大利亚教育证书（SACE）。南澳大利亚州高级中学评估委员会（SSABSA）管理南澳大利亚州所有符合资格的学生入学并进入澳大利亚大学的SACE。为SACE学习的学生通常在两年内学习第一阶段（11年级）和第二阶段（12年级）的课程。
Mercedes College is South Australia's only Catholic school offering the IB Organisation curriculum from Reception to Year 12, and one of just a handful of schools delivering the programme at all three levels. For more than 30 years, students at Mercedes College have studied the International Baccalaureate (IB) curriculum. From Reception to Year 5, students participate in our IB Primary Years Programme. Then, from Year 6 to Year 10 they study our IB Middle Years Programme. Students in Years 11 and 12 may choose to complete the IB Diploma Programme or the South Australian Certificate of Education. Regardless of their choice, having studied the IB programme students are well equipped for success. No other curriculum more comprehensively prepares students for life in an increasingly intercultural world, nor more effectively opens their minds to a life independent learning. It develops inquiring, knowledgeable and caring young people who help to create a better and more peaceful world through intercultural understanding and respect. There's no doubt, that students at Mercedes College are provided with a unique education with the Australian curriculum taught through the Primary Years Programme (PYP) and Middle Years Programme (MYP) frameworks. Each of the IB Programmes enables students to make sense of the complexities of the world around them, as well as equipping them with the skills and qualities needed for taking responsible action for the future. The programmes cross disciplines, plus cultural, national and geographical boundaries, championing critical thinking, stimulating ideas, and effective relationships.