This combined chart visualizes 200 weeks of student performance data, showing study hours as blue bars, sleep hours as a dashed green line, and exam scores as a red line across a shared timeline. The visualization uses two distinct y-axes—a left axis for hours and a right axis for exam scores—to accommodate the different measurement scales. Built with D3 v7, the chart employs `scaleBand`, `scaleLinear`, `d3.line` with `curveMonotoneX`, and `d3.axisLeft`/`d3.axisRight` to render the SVG elements, including custom gridlines and a legend.