Finishing IGETC in fall or Spring?

Hello, I only have one section of IGETC left before I am finished with it. l (science without lab). Im hoping to transfer to UCLA and just want to make my app as competitive as possible. Is there any advantage to finishing it in fall rather than spring? Would I look more competitive or should I just finish it in spring? Thanks

Forgot to add that my schedule currently is full which is why it would be difficult to finish igetc

Spring is fine. Always better to get major req. done first.