Passing v-ups

When I do these exercises, I do them all together. That means that by the time I reach v-ups I've done straddle hollow Hold and 1/2 windshield wipers. 

I can't get past 4x12. 4x9, no problem. V-ups in workouts where I'm not smoked, no problem. But with the other core exercises, I'm killed.

i keep progressing in the other two, which only makes v-ups harder!

Any thoughts on how to mark myself as passed on 4x12? Should I just do them on a separate day??

Apparenlty the trick was taking the 5 minutes it took to write this post as a break between windshield wipers and v-ups! Passes 4x12 no problem!