<p>Meanings of the levels: </p><ul>
 <li>E1 - E6: Elementary school, year 1 to 6.
 </li><li>H1 - H6: Secondary school, year 1 to 6.
 </li><li>U1 - U5: University, year 1 to 5.
 </li><li>G: University, Graduate study.
 </li><li>R: Research.
</li></ul>
