One of the secrets of standardized tests like these is they are evaluations of school/teaching quality as much as they are of students. They are intended to ensure students are meeting a minimum proficiency in certain skills/knowledge. Schools want to ensure students do as well as possible in part because if they don’t it reflects poorly on them. As others have said, as long as you take the test seriously and take your time you should do fine, especially if you’re doing ok in your classes.