Well firstly, the majority of the reason for why so many people get A+s in school is because the students actually have the SACs with them. My school doesn't like to change the SACs, and uses the same ones every year, so the year 12's of every year end up selling them to the new year 12 students. Heck, many people get A+s, good on them, they are wonderful cheaters. Don't worry about that student who got A+ all year but didn't end up with a 40+, because I can tell you right now that a student with less than A for his SACs all year, and also got a D on his first chem sac with rank ~15 got a 50, raw. How though, well people from his school had the chemistry sacs, so all the top end students didn't end up with 40+ because they had never actually sat a proper SAC, as they would've had the answers previously. This guy didn't give up, with a total of 75+ practice exams for chem, he full marked the exam, yes, full marks.
Don't give up, the least you can do is keep pushing, no one ever said it would be easy. Believe in yourself and put your faith in your work. Head up!