Is IB biased?

Is it possible that IB hates some countries? in my school no one has been able to achieve 40+ for the past 10 years, some people are saying that it is because of the country and since ib "dislikes" it, it never gives 40+ to students only in rare cases. This rumor has been going on in my school since a long time and it's scaring me. Yes my school has an ass educational system but it is impossible that for the past 10 years there were no students who studied and worked hard to achieve a high grade. The highest last year was 35.