<p>Why not? It won’t hurt your GPA.</p>
<p>And if you’re planning on doing courses that are risky that you only plan to spend time on if you exhaust the time you spend in your more important courses. Then take it later, full credit.</p>
<p>The advantages?</p>
<ul>
<li>you get access to past exams and the solutions of them + solutions to past homework problems that way - and you can then use them towards the next time you take the course. This could be especially advantageous as compared to if you only decided to take the course later.</li>
</ul>
<p>Yes - of course - oftentimes you have access to the solutions/tests off the course websites. But professors aren’t always liberal in posting them online (which pretty much forces you to take the class to gain access to them)</p>