I consistently got 18s on BC PAT's first 5 tests. I also struggle with the keyholes…I think while it's important to improve in that area, you should focus on hole punching, cubes, and pattern folding. With the generators, it's fairly easy to improve and make sure you at least get those points. Even TFE is easy enough to master with practice. I'm still only getting half of the keyholes right, but I'm now averaging a 20.