You have the right to know what is required to achieve a certain grade
Your teacher must explain the grading requirements
For each subject there is a curriculum that your teacher must follow. The curriculum describes the aims and goals of the subject, i.e. what students should know about the subject once they have finished studying it. There is a list of proficiency requirements for each subject that students must fulfil to get a certain grade. Your teach must clearly explain the subject's goals and what is required to fulfil the proficiency requirements as soon as you start studying a subject.
You're entitled to know how the teacher will assess your performance. The assessment must be based on the proficiency requirements. You can always speak with your teacher about this. You should be given this information for all subjects you're being taught at least once a term.
Can I appeal a grade?
You cannot appeal a grade, although you always have the right to an explanation for why you didn't achieve a certain grade. The SSI will not investigate complaints regarding incorrect grades.
If there are clear errors in relation to a grade, such as a typo, the school principal can ensure that such errors are corrected. The school principal may not overrule a grade given by a teacher, however. If you're concerned about your performance, it's important that you speak with your teacher about how you're doing before the grades are given. You have a right to do this.
Can I retake an assessment?
During the nine grades of compulsory schooling you can retake the test again an assessment to try for a higher grade, even if you received grade E or higher. At upper secondary school, however, you can only try to achieve a higher grade if you received a grade F or failed in a subject. The assessment covers the entire subject and the entire course. Retaking an assessment involves far more than just submitting supplementary work. Speak with your school principal about how retaking an assessment works.