You can use an NS trainer and choose only 12 cases with different OLLs
SpeedSolving Puzzles Community
CubeLite
L4NC3_D4_AS14N
Can I get a link for the trainer please? I can't find one
CubeLite
Here
mihlefeld.github.io
NS2 Trainer
mihlefeld.github.io
L4NC3_D4_AS14N
Thank you 
L4NC3_D4_AS14N
I need a good z perm alg for skewb. I've been just doing 2 u perms this whole time and idk if I should learn the z perm alg