feat(exam): add SAT style testing component

src/lib/utils.ts

@@ -75,3 +75,9 @@ export function getRandomColor() {
   ];
   return colors[Math.floor(Math.random() * colors.length)];
 }
+
+export const formatTime = (seconds: number) => {
+  const m = Math.floor(seconds / 60);
+  const s = seconds % 60;
+  return `${m}:${s.toString().padStart(2, "0")}`;
+};