The bar charts below illustrate the distribution of Math scores in the Vietnamese National High School Graduation Exam over a four-year period, from 2022 to 2025. Summarise the information by selecting and reporting the main features, and make comparisons where relevant .

The bar charts show the distribution of Math scores in the Vietnamese National High School Graduation Exam from 2022 to 2025. Overall, while most students scored between 5 and 8 throughout the period, 2025 showed a global downward trend in performance. Notably, 2025 featured a left-skewed distribution with a record-high number of perfect scores, despite […]