There is no way to judge by how many questions you get wrong, because the scores for each question are different. In terms of scores, a score of 80 or above is a B grade.

The junior high school academic proficiency test is referred to as the "High School Entrance Examination". It is a proficiency test to test whether junior high school students have reached the academic level of junior high school and a high school selective test based on nine-year compulsory education. It is a necessary condition for the issuance of junior high school diplomas and an extremely important test.