With an overall PTE score of 50 and a 57% in your 12th grade, you may be eligible to apply for certain programs in Australia, although specific requirements can vary by institution and course. It's important to verify the exact admission criteria of the universities or colleges you are interested in. For detailed advice and assistance in choosing the right program and ensuring your application meets all requirements, consider reaching out to Invicta Career Consultancy. They can provide personalized support to enhance your application and guide you through the process, While there are other options available, hence you can pay a visit to their website (icclearning.com) and get consult with them for better guidance. All the best to you.