1. Design a bar chart to show average exam scores by grade and gender, with data filtered for valid score ranges (0-100). 2. Create a scatter plot to display the correlation between after-school study hours and math scores. 3. Add a pie chart to present the proportion of students with different homework completion rate tiers (≥90%, 70%-89%, <70%). 4. Build a heatmap to reflect the relationship between parental involvement levels and overall academic performance.