Remove unused imports and changed and improved layout design and responsiveness in some components and fixed some bugs.

src/pages/official-exam.tsx

@@ -27,7 +27,6 @@ import axios from "axios";
 import clsx from "clsx";
 import { withIronSessionSsr } from "iron-session/next";
 import { uniqBy } from "lodash";
-import moment from "moment";
 import Head from "next/head";
 import { useRouter } from "next/router";
 import { useMemo, useState } from "react";