I would say retake if Logic Games was holding you back. In one month, you can probably get close to -0 with the fool-proof method. Also mention your concussion in your addendum since that's a legitimate reason for your under-performance.
@MissChanandler that’s a good idea. As much as we hate it, the “test day penalty” seems to be a common occurrence. I will probably start doing a second LG too since I fool-proof anyway. Thanks for sharing!