OOOF I totally get you, this quadmester has been messing with my head. While your eng mark is on the low side, you can always redo it, its better to redo it then limit your options. Plus, repeating the course won't be such a big deal like many people say, universities will see your best grade first. Take this in reference, for my grade 11 advanced function, when I was in the IB program I didn't do so good (58%
, but then I repeated it and got a 93% in normal high school setting (lol I know that jump is pretty big but IB really makes everything complicated for no reason lol) and my best mark is the one that;s going to university so yeah if you can and if you want to, re-do it! Wishing you all the best!