The passing marks out of 80 depend on the exam and the board. For CBSE Class 10 and 12 exams, students must obtain a minimum of 26 marks out of 80 to pass the exam. For ICSE Class 10 exams, students must score at least 26 marks out of 80 to pass. However, it is important to note that the passing marks may vary depending on the subject and the board.