<p>I’m not doing IB but it seems as if your only option would be to take Naval Science and drop whatever class is in that block. I would think that Naval Science, which unlocks all/most of your EC’s would be more important than whatever class fills up that block/period atm.</p>
<p>Sorry if this was unhelpful because I may not have fully comprehended your problem. </p>
<p>Best of luck.</p>