Match Me 3.5UW GPA, 1 of 130+, School President, Int'l, Need [full] Financial Aid, Weak Extracurriculars [chemical or environmental engineering]

I should be around 3.9+ if calculating with the grading system you typed. All my A’s are 75+ so A+? Grade 11 was 6A’s, 2B’s (74 and 70) and a C (63). Grade 12 7A’s (all are 75+) 1 B and 1C. We don’t use +/- in school or in WASSCE and they only give grades (no exacr scores)

Can I get a clearer typing of the grading calculations?